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 Class   G9BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
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 CROSS-REFERENCE ART COLLECTIONS
 
[List of Patents for class g9b subclass 3] 3           Recording by mechanical cutting, deforming or pressing, e.g. of grooves or pits; Reproducing by mechanical sensing; Record carriers therefor G9B/11[N: and G9B/13] take precedence; recording by cutting or deforming using laser beam G9B/7, using electron beam G9B/9.025){G11B 3/00}
[List of Patents for class g9b subclass 3.001] 3.001           Subclass 3.001 indent level is 1 [N: with vibrating mechanical coupling means between pick-up element and sound producing element] {G11B 3/00A}
 [List of Patents for class g9b subclass 3.002] 3.002           Subclass 3.002 indent level is 2 [N: element with stationary record carriers] {G11B 3/00A1}
[List of Patents for class g9b subclass 3.003] 3.003           Subclass 3.003 indent level is 1 [N: Devices for transmitting, directing, amplifying sound (in general G10K11/18)] {G11B 3/00B}
 [List of Patents for class g9b subclass 3.004] 3.004           Subclass 3.004 indent level is 2 [N: through hollow arms] {G11B 3/00B1}
 [List of Patents for class g9b subclass 3.005] 3.005           Subclass 3.005 indent level is 2 [N: using horns] {G11B 3/00B2}
 [List of Patents for class g9b subclass 3.006] 3.006           Subclass 3.006 indent level is 1 [N: Devices for controlling sound e.g. using acoustical impedances, using valves] {G11B 3/00C}
 [List of Patents for class g9b subclass 3.007] 3.007           Subclass 3.007 indent level is 1 [N: for digital information] {G11B 3/00D}
[List of Patents for class g9b subclass 3.008] 3.008           Subclass 3.008 indent level is 1 Arrangements of heads (styli G9B/3.076) {G11B 3/02}
 [List of Patents for class g9b subclass 3.009] 3.009           Subclass 3.009 indent level is 2 Multiple, convertible, or alternative transducing arrangements [N: contains no documents see G9B/3.075] {G11B 3/04}
 [List of Patents for class g9b subclass 3.01] 3.01           Subclass 3.01 indent level is 2 Determining or indicating positions of head {G11B 3/06}
[List of Patents for class g9b subclass 3.011] 3.011           Subclass 3.011 indent level is 2 Raising, lowering, traversing otherwise than for transducing, arresting, or holding-up heads against record carriers [N: for transducing G9B/3.052, G9B/3.071] {G11B 3/08}
[List of Patents for class g9b subclass 3.012] 3.012           Subclass 3.012 indent level is 3 [N: using automatic means ( G9B/3.044 takes precedence; [N: if particularly adapted for record-changers see G9B/17.045 and subgroups]) {G11B 3/085}
[List of Patents for class g9b subclass 3.013] 3.013           Subclass 3.013 indent level is 4 [N: Control of drive of the head] {G11B 3/085A}
[List of Patents for class g9b subclass 3.014] 3.014           Subclass 3.014 indent level is 5 [N: for pivoting pick-up arms] {G11B 3/085A1}
 [List of Patents for class g9b subclass 3.015] 3.015           Subclass 3.015 indent level is 6 [N: using mechanical detecting means] {G11B 3/085A1A}
 [List of Patents for class g9b subclass 3.016] 3.016           Subclass 3.016 indent level is 6 [N: using optical detecting means] {G11B 3/085A1B}
 [List of Patents for class g9b subclass 3.017] 3.017           Subclass 3.017 indent level is 6 [N: using magnetic detecting means] {G11B 3/085A1C}
[List of Patents for class g9b subclass 3.018] 3.018           Subclass 3.018 indent level is 5 [N: for pick-up arms moving parallel to itself] {G11B 3/085A2}
 [List of Patents for class g9b subclass 3.019] 3.019           Subclass 3.019 indent level is 6 [N: using mechanical detecting means] {G11B 3/085A2A}
 [List of Patents for class g9b subclass 3.02] 3.02           Subclass 3.02 indent level is 6 [N: using optical detecting means] {G11B 3/085A2B}
 [List of Patents for class g9b subclass 3.021] 3.021           Subclass 3.021 indent level is 6 [N: using magnetic or electric detecting means] {G11B 3/085A2C}
 [List of Patents for class g9b subclass 3.022] 3.022           Subclass 3.022 indent level is 5 [N: for fixed arms carrying a movable head] {G11B 3/085A3}
[List of Patents for class g9b subclass 3.023] 3.023           Subclass 3.023 indent level is 4 [N: Driving the head] {G11B 3/085B}
[List of Patents for class g9b subclass 3.024] 3.024           Subclass 3.024 indent level is 5 [N: the head being driven by the same means as the record can] {G11B 3/085B1}
[List of Patents for class g9b subclass 3.025] 3.025           Subclass 3.025 indent level is 6 [N: for pivoting pick-up arms] {G11B 3/085B1A}
[List of Patents for class g9b subclass 3.026] 3.026           Subclass 3.026 indent level is 7 [N: driven by cams] {G11B 3/085B1A1}
[List of Patents for class g9b subclass 3.027] 3.027           Subclass 3.027 indent level is 8 [N: using friction coupling] {G11B 3/085B1A1C}
[List of Patents for class g9b subclass 3.029] 3.029           Subclass 3.029 indent level is 6 [N: for pick-up arms moving parallel to itself] {G11B 3/085B1B}
 [List of Patents for class g9b subclass 3.03] 3.03           Subclass 3.03 indent level is 7 [N: driven by belt or analogous element] {G11B 3/085B1B1}
 [List of Patents for class g9b subclass 3.031] 3.031           Subclass 3.031 indent level is 7 [N: driven by non-skip driving means, e.g. lead screw] {G11B 3/085B1B2}
[List of Patents for class g9b subclass 3.032] 3.032           Subclass 3.032 indent level is 5 [N: the head being driven by means independent of the record carrier driving means] {G11B 3/085B2}
[List of Patents for class g9b subclass 3.033] 3.033           Subclass 3.033 indent level is 6 [N: for pivoting pick-up arms] {G11B 3/085B2A}
[List of Patents for class g9b subclass 3.034] 3.034           Subclass 3.034 indent level is 7 [N: driven by means which support the pick-up arm] {G11B 3/085B2A1}
[List of Patents for class g9b subclass 3.035] 3.035           Subclass 3.035 indent level is 8 [N: the supporting element being different from the rotation-axes] {G11B 3/085B2A1C}
[List of Patents for class g9b subclass 3.036] 3.036           Subclass 3.036 indent level is 9 [N: for the vertical movement only] {G11B 3/085B2A1C1}
 [List of Patents for class g9b subclass 3.037] 3.037           Subclass 3.037 indent level is 10 [N: using mechanical means] {G11B 3/085B2A1C1A}
 [List of Patents for class g9b subclass 3.038] 3.038           Subclass 3.038 indent level is 10 [N: using electrical/magnetic means] {G11B 3/085B2A1C1B}
[List of Patents for class g9b subclass 3.039] 3.039           Subclass 3.039 indent level is 6 [N: for pick-up arm moving parallel to itself] {G11B 3/085B2B}
 [List of Patents for class g9b subclass 3.04] 3.04           Subclass 3.04 indent level is 7 [N: driven by belt or analogous element] {G11B 3/085B2B1}
 [List of Patents for class g9b subclass 3.041] 3.041           Subclass 3.041 indent level is 7 [N: driven by non-skip driving means, e.g. lead screw] {G11B 3/085B2B2}
 [List of Patents for class g9b subclass 3.042] 3.042           Subclass 3.042 indent level is 6 [N: for fixed arms carrying a movable head] {G11B 3/085B2C}
 [List of Patents for class g9b subclass 3.043] 3.043           Subclass 3.043 indent level is 3 using manual means only ( G9B/3.044 takes precedence) {G11B 3/09}
[List of Patents for class g9b subclass 3.044] 3.044           Subclass 3.044 indent level is 3 for repeating a part of the record; for beginning or stopping at a desired point of the record {G11B 3/095}
[List of Patents for class g9b subclass 3.045] 3.045           Subclass 3.045 indent level is 4 [N: using automatic means] {G11B 3/095A}
 [List of Patents for class g9b subclass 3.048] 3.048           Subclass 3.048 indent level is 4 [N: using magnetic means ( G9B/3.05 takes precedence)] {G11B 3/09A}
 [List of Patents for class g9b subclass 3.049] 3.049           Subclass 3.049 indent level is 4 [N: using mechanical means ( G9B/3.05 takes precedence)] {G11B 3/09B}
 [List of Patents for class g9b subclass 3.05] 3.05           Subclass 3.05 indent level is 4 [N: Means coupled to the cover] {G11B 3/09C}
[List of Patents for class g9b subclass 3.051] 3.051           Subclass 3.051 indent level is 2 Arranging, supporting, or driving of heads or of transducers relatively to record carriers [N: guiding record carriers G9B/17, driving record carriers G9B/19] {G11B 3/10}
[List of Patents for class g9b subclass 3.052] 3.052           Subclass 3.052 indent level is 3 Supporting in balanced, counterbalanced or loaded operative position [N: during transducing], e.g. loading in direction of traverse] {G11B 3/12}
[List of Patents for class g9b subclass 3.053] 3.053           Subclass 3.053 indent level is 4 [N: By using mechanical means not provided for in G9B/3.059, G9B/3.063, e.g. using cams] {G11B 3/12A}
 [List of Patents for class g9b subclass 3.054] 3.054           Subclass 3.054 indent level is 5 [N: Providing horizontal force; e.g. anti-skating ( G9B/3.055 takes precedence)] {G11B 3/12A1}
 [List of Patents for class g9b subclass 3.055] 3.055           Subclass 3.055 indent level is 5 [N: Damping means therefor] {G11B 3/12A2}
[List of Patents for class g9b subclass 3.056] 3.056           Subclass 3.056 indent level is 4 [N: by using electric or magnetic means] {G11B 3/12B}
 [List of Patents for class g9b subclass 3.057] 3.057           Subclass 3.057 indent level is 5 [N: Providing horizontal force, e.g. anti-skating force ( G9B/3.058 takes precedence)] {G11B 3/12B1}
 [List of Patents for class g9b subclass 3.058] 3.058           Subclass 3.058 indent level is 5 [N: Damping means therefor] {G11B 3/12B2}
[List of Patents for class g9b subclass 3.059] 3.059           Subclass 3.059 indent level is 4 by using effects of gravity or inertia, e.g. counterweight G9B/3.067 takes precedence) {G11B 3/14}
 [List of Patents for class g9b subclass 3.06] 3.06           Subclass 3.06 indent level is 5 [N: Providing horizontal force; e.g. anti-skating force ( G9B/3.062 takes precedence)] {G11B 3/14A}
 [List of Patents for class g9b subclass 3.061] 3.061           Subclass 3.061 indent level is 5 adjustable {G11B 3/16}
 [List of Patents for class g9b subclass 3.062] 3.062           Subclass 3.062 indent level is 5 Damping by using viscosity effect {G11B 3/18}
 [List of Patents for class g9b subclass 3.063] 3.063           Subclass 3.063 indent level is 4 by elastic means, e.g. spring ( G9B/3.067 takes precedence) {G11B 3/20}
[List of Patents for class g9b subclass 3.064] 3.064           Subclass 3.064 indent level is 4 adjustable {G11B 3/22}
[List of Patents for class g9b subclass 3.068] 3.068           Subclass 3.068 indent level is 3 Supporting in an inoperative position {G11B 3/30}
[List of Patents for class g9b subclass 3.071] 3.071           Subclass 3.071 indent level is 3 Driving or guiding during transducing operation {G11B 3/34}
 [List of Patents for class g9b subclass 3.075] 3.075           Subclass 3.075 indent level is 3 with provision for adaptation or interchange of heads {G11B 3/42}
[List of Patents for class g9b subclass 3.076] 3.076           Subclass 3.076 indent level is 1 Styli, e.g. sapphire, diamond {G11B 3/44}
 [List of Patents for class g9b subclass 3.077] 3.077           Subclass 3.077 indent level is 2 [N: Styli particularly adapted for sensing video discs] {G11B 3/44A}
[List of Patents for class g9b subclass 3.078] 3.078           Subclass 3.078 indent level is 2 Constructions or forms [N: Disposition or mounting], e.g. attachment of point to shank [N: attachment of stylus directly to transducer H04R1/16] {G11B 3/46}
 [List of Patents for class g9b subclass 3.079] 3.079           Subclass 3.079 indent level is 3 Needles [N: contains no documents] {G11B 3/48}
 [List of Patents for class g9b subclass 3.08] 3.08           Subclass 3.08 indent level is 2 Anvils or other supports opposing stylus forces {G11B 3/50}
 [List of Patents for class g9b subclass 3.081] 3.081           Subclass 3.081 indent level is 2 Arrangements permitting styli to yield under excessive pressure {G11B 3/52}
 [List of Patents for class g9b subclass 3.082] 3.082           Subclass 3.082 indent level is 2 Storing; manipulating, e.g. feeding styli to and from heads (needle boxes, receptacles for needles B65D85/24) {G11B 3/54}
 [List of Patents for class g9b subclass 3.083] 3.083           Subclass 3.083 indent level is 2 Sharpening (grinding B24B3/00, B24B19/00) {G11B 3/56}
[List of Patents for class g9b subclass 3.084] 3.084           Subclass 3.084 indent level is 1 Cleaning record carriers or styli, e.g. removing shavings or dust [N: or electrostatic charges] (brushes A46B; cleaning in general B08B) [N: carrying-off electrostatic charges in general H05F3/00] {G11B 3/58}
[List of Patents for class g9b subclass 3.085] 3.085           Subclass 3.085 indent level is 2 [N: during transducing operation] {G11B 3/58A}
[List of Patents for class g9b subclass 3.086] 3.086           Subclass 3.086 indent level is 3 [N: for record carriers] {G11B 3/58A1}
[List of Patents for class g9b subclass 3.087] 3.087           Subclass 3.087 indent level is 4 [N: using means contacting the record carrier] {G11B 3/58A1A}
 [List of Patents for class g9b subclass 3.088] 3.088           Subclass 3.088 indent level is 5 [N: means connected to the pick-up arm or head] {G11B 3/58A1A1}
 [List of Patents for class g9b subclass 3.089] 3.089           Subclass 3.089 indent level is 5 [N: means connected to a separate arm] {G11B 3/58A1A2}
[List of Patents for class g9b subclass 3.09] 3.09           Subclass 3.09 indent level is 4 [N: using means not contacting the record carrier] {G11B 3/58A1B}
 [List of Patents for class g9b subclass 3.091] 3.091           Subclass 3.091 indent level is 5 [N: connected to the pick-up arm or head] {G11B 3/58A1B1}
 [List of Patents for class g9b subclass 3.092] 3.092           Subclass 3.092 indent level is 5 [N: connected to a separate arm] {G11B 3/58A1B2}
 [List of Patents for class g9b subclass 3.093] 3.093           Subclass 3.093 indent level is 3 [N: for styli or needles only] {G11B 3/58A2}
 [List of Patents for class g9b subclass 3.094] 3.094           Subclass 3.094 indent level is 2 [N: before or after transducing operation] {G11B 3/58B}
[List of Patents for class g9b subclass 3.095] 3.095           Subclass 3.095 indent level is 1 Turntables for record carriers (forming rotor of dynamo-electric motor H02K) [N: contains no documents, see G9B/19.028] {G11B 3/60}
 [List of Patents for class g9b subclass 3.096] 3.096           Subclass 3.096 indent level is 2 Damping of vibrations of record carriers on turntables [N: see provisionally also G9B/3.095, G9B/3.094 and G9B/17.002; contains no documents, see G9B/19.029] {G11B 3/61}
 [List of Patents for class g9b subclass 3.097] 3.097           Subclass 3.097 indent level is 1 Re-recording, i.e. transcribing information from one grooved record carrier on to one or more similar or dissimilar record carriers [N: (by varying the order of the information G9B/27.009, G9B/27.013)] {G11B 3/64}
 [List of Patents for class g9b subclass 3.098] 3.098           Subclass 3.098 indent level is 1 Erasing information, e.g. for reuse of record carrier {G11B 3/66}
[List of Patents for class g9b subclass 3.099] 3.099           Subclass 3.099 indent level is 1 Record carriers {G11B 3/68}
 [List of Patents for class g9b subclass 3.1] 3.1           Subclass 3.1 indent level is 2 [N: comprising protective coatings e.g. anti static, anti-friction] {G11B 3/68A}
 [List of Patents for class g9b subclass 3.101] 3.101           Subclass 3.101 indent level is 2 [N: Intermediate mediums] {G11B 3/68B}
 [List of Patents for class g9b subclass 3.102] 3.102           Subclass 3.102 indent level is 2 [N: Testing thereof (investigating chemical or physical properties of materials G01N)] {G11B 3/68C}
[List of Patents for class g9b subclass 3.103] 3.103           Subclass 3.103 indent level is 2 characterised by the selection of material or structure; Processes or apparatus specially adapted for manufacturing record carriers (processes involving a single technical art and for which provision exists elsewhere, see the relevant places, e.g. B29D17/00) {G11B 3/70}
 [List of Patents for class g9b subclass 3.104] 3.104           Subclass 3.104 indent level is 3 [N: for video discs with grooves ( G9B/3.105 takes precedence)] {G11B 3/70A}
[List of Patents for class g9b subclass 3.105] 3.105           Subclass 3.105 indent level is 3 [N: characterised by the selection of the material only] {G11B 3/70B}
 [List of Patents for class g9b subclass 3.106] 3.106           Subclass 3.106 indent level is 4 [N: for video discs with grooves] {G11B 3/70B1}
[List of Patents for class g9b subclass 3.107] 3.107           Subclass 3.107 indent level is 2 Groove formations, e.g. run-in groove, run-out groove {G11B 3/72}
 [List of Patents for class g9b subclass 3.108] 3.108           Subclass 3.108 indent level is 3 Multiple output tracks, e.g. binaural stereophonic {G11B 3/74}
 [List of Patents for class g9b subclass 3.109] 3.109           Subclass 3.109 indent level is 3 forming part of cinematograph films {G11B 3/76}
 [List of Patents for class g9b subclass 3.11] 3.11           Subclass 3.11 indent level is 2 Multiple-track arrangements {G11B 3/78}
 [List of Patents for class g9b subclass 3.111] 3.111           Subclass 3.111 indent level is 2 incorporating subsidiary guide means for heads, other than modulated grooves; Part-formed unmodulated grooves for conversion into transducing grooves {G11B 3/80}
 [List of Patents for class g9b subclass 3.112] 3.112           Subclass 3.112 indent level is 2 with means indicating prior or unauthorised use {G11B 3/90}
[List of Patents for class g9b subclass 5] 5           Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor ( G9B/11[N: and G9B/13] take precedence){G11B 5/00}
 [N: Note
 [C0201]
 In this group, the expression "+IDT" is used to indicate:
 - that the documents classified here were classified in IDT-groups concerning:
 "Methods or devices for magnetising carriers or for reproducing by magnetic means; Electric circuit arrangements therefor"
 - that they were reclassified administratively from said IDT-groups to this group]
 Note
 Subgroups G9B/5.026 to G9B/5.308 take precedence over subgroups G9B/5.001 to G9B/5.025
 
 [List of Patents for class g9b subclass 5.001] 5.001           Subclass 5.001 indent level is 1 Recording on, or reproducing or erasing from, magnetic drums ( G9B/19 takes precedence) {G11B 5/004}
[List of Patents for class g9b subclass 5.002] 5.002           Subclass 5.002 indent level is 1 Recording on, or reproducing or erasing from, magnetic tapes, [N: sheets, e.g. cards,] or wires ( G9B/15[N: G9B/19] take precedence; [N: bulk transferring of information magnetisation for re-recording G9B/5.309; marking record carriers in digital fashion G06K)] {G11B 5/008}
[List of Patents for class g9b subclass 5.003] 5.003           Subclass 5.003 indent level is 2 [N: magnetic sheets (rotating sheets G9B/5.024)] {G11B 5/008S}
 [List of Patents for class g9b subclass 5.004] 5.004           Subclass 5.004 indent level is 3 [N: magnetic cards] {G11B 5/008S2}
[List of Patents for class g9b subclass 5.005] 5.005           Subclass 5.005 indent level is 2 [N: magnetic tapes] {G11B 5/008T}
[List of Patents for class g9b subclass 5.006] 5.006           Subclass 5.006 indent level is 3 [N: on longitudinal tracks only, e.g. for serpentine format recording] {G11B 5/008T2}
[List of Patents for class g9b subclass 5.012] 5.012           Subclass 5.012 indent level is 3 [N: on transverse tracks ( G9B/5.019 takes precedence)] {G11B 5/008T4}
[List of Patents for class g9b subclass 5.019] 5.019           Subclass 5.019 indent level is 3 [N: transducing different track configurations or formats on the same tape] {G11B 5/008T6}
[List of Patents for class g9b subclass 5.02] 5.02           Subclass 5.02 indent level is 4 [N: configurations only, e.g. longitudinal and transverse] {G11B 5/008T6C}
 [List of Patents for class g9b subclass 5.021] 5.021           Subclass 5.021 indent level is 5 [N: simultaneously] {G11B 5/008T6C2}
[List of Patents for class g9b subclass 5.022] 5.022           Subclass 5.022 indent level is 4 [N: formats only, e.g. analog and digital] {G11B 5/008T6F}
 [List of Patents for class g9b subclass 5.023] 5.023           Subclass 5.023 indent level is 5 [N: simultaneously] {G11B 5/008T6F2}
[List of Patents for class g9b subclass 5.024] 5.024           Subclass 5.024 indent level is 1 Recording on, or reproducing or erasing from, magnetic discs ( G9B/17, G9B/19 take precedence) {G11B 5/012}
 [List of Patents for class g9b subclass 5.025] 5.025           Subclass 5.025 indent level is 2 using magnetic foils {G11B 5/016}
[List of Patents for class g9b subclass 5.026] 5.026           Subclass 5.026 indent level is 1 Recording, reproducing, or erasing methods; Read, write or erase circuits therefor (timing or synchronising arrangements G9B/27.017) {G11B 5/02}
[List of Patents for class g9b subclass 5.027] 5.027           Subclass 5.027 indent level is 2 Erasing {G11B 5/024}
 [List of Patents for class g9b subclass 5.028] 5.028           Subclass 5.028 indent level is 3 [N: Bulk erasing] {G11B 5/024B}
[List of Patents for class g9b subclass 5.029] 5.029           Subclass 5.029 indent level is 2 Analogue recording {G11B 5/027}
 [List of Patents for class g9b subclass 5.03] 5.03           Subclass 5.03 indent level is 3 [N: Boundary displacement recording] {G11B 5/027B}
 [List of Patents for class g9b subclass 5.031] 5.031           Subclass 5.031 indent level is 3 Biasing {G11B 5/03}
 [List of Patents for class g9b subclass 5.032] 5.032           Subclass 5.032 indent level is 3 Equalising {G11B 5/035}
 [List of Patents for class g9b subclass 5.033] 5.033           Subclass 5.033 indent level is 2 Digital recording {G11B 5/09}
[List of Patents for class g9b subclass 5.034] 5.034           Subclass 5.034 indent level is 1 Structure or manufacture of housings or shields for heads {G11B 5/10}
 [List of Patents for class g9b subclass 5.035] 5.035           Subclass 5.035 indent level is 2 Mounting of head within housing [N: or assembling of head and housing ( G9B/5.078 takes precedence)] {G11B 5/105}
 [List of Patents for class g9b subclass 5.036] 5.036           Subclass 5.036 indent level is 2 [N: Manufacture of housing] [C9704] {G11B 5/10A}
[List of Patents for class g9b subclass 5.037] 5.037           Subclass 5.037 indent level is 2 Shielding of head against electric or magnetic fields {G11B 5/11}
 [List of Patents for class g9b subclass 5.038] 5.038           Subclass 5.038 indent level is 3 Shielding devices arranged between heads or windings ([N: G9B/5.068], G9B/5.075 take precedence) {G11B 5/115}
 [List of Patents for class g9b subclass 5.039] 5.039           Subclass 5.039 indent level is 3 [N: Manufacture of shielding device] {G11B 5/11A}
[List of Patents for class g9b subclass 5.04] 5.04           Subclass 5.04 indent level is 1 Structure or manufacture of heads, e.g. inductive {G11B 5/127}
 [List of Patents for class g9b subclass 5.041] 5.041           Subclass 5.041 indent level is 2 [N: Assembling or shaping of elements ( G9B/5.044 takes precedence)] {G11B 5/127A}
[List of Patents for class g9b subclass 5.042] 5.042           Subclass 5.042 indent level is 2 [N: with "composite" cores, i.e. cores composed in some parts of magnetic particles and in some other parts of magnetic metal layers] {G11B 5/127C}
 [List of Patents for class g9b subclass 5.043] 5.043           Subclass 5.043 indent level is 3 [N: including at least one magnetic thin film] {G11B 5/127C2}
 [List of Patents for class g9b subclass 5.044] 5.044           Subclass 5.044 indent level is 2 [N: specially adapted for magnetisations perpendicular to the surface of the record carrier] {G11B 5/127P}
[List of Patents for class g9b subclass 5.045] 5.045           Subclass 5.045 indent level is 2 with cores composed of particles, e.g. with dust core, with ferrite core [N: with cores composed of isolated magnetic particles (in thin films G9B/5.077)] {G11B 5/133}
 [List of Patents for class g9b subclass 5.046] 5.046           Subclass 5.046 indent level is 3 [N: Assembling or shaping of elements] {G11B 5/133A}
[List of Patents for class g9b subclass 5.047] 5.047           Subclass 5.047 indent level is 2 with cores being composed of metal sheets, i.e. laminated cores [N: with cores composed of isolated magnetic layers, e.g. sheets (in thin films G9B/5.077)] {G11B 5/147}
 [List of Patents for class g9b subclass 5.048] 5.048           Subclass 5.048 indent level is 3 [N: Assembling or shaping of elements ( G9B/5.049 takes precedence)] {G11B 5/147A}
 [List of Patents for class g9b subclass 5.049] 5.049           Subclass 5.049 indent level is 3 with tape-wound cores {G11B 5/153}
 [List of Patents for class g9b subclass 5.05] 5.05           Subclass 5.05 indent level is 2 Construction or disposition of windings {G11B 5/17}
[List of Patents for class g9b subclass 5.051] 5.051           Subclass 5.051 indent level is 2 Structure or manufacture of the surface of the head in physical contact with, or immediately adjacent to the recording medium; Pole pieces; Gap features ( G9B/5.068, [N: G9B/5.075], G9B/5.077 take precedence) {G11B 5/187}
[List of Patents for class g9b subclass 5.052] 5.052           Subclass 5.052 indent level is 3 [N: Shaping or contouring of the transducing or guiding surface] {G11B 5/187A}
[List of Patents for class g9b subclass 5.055] 5.055           Subclass 5.055 indent level is 3 [N: "Composite" pole pieces, i.e. poles composed in some parts of magnetic particles and in some other parts of magnetic metal layers] {G11B 5/187C}
 [List of Patents for class g9b subclass 5.058] 5.058           Subclass 5.058 indent level is 3 the pole pieces being ferrite [N: or other magnetic particles ( G9B/5.052 takes precedence; in thin film G9B/5.077)] {G11B 5/193}
 [List of Patents for class g9b subclass 5.059] 5.059           Subclass 5.059 indent level is 3 the pole pieces being of ferrous sheet metal [N: or other magnetic layers ( G9B/5.052 takes precedence; in thin film G9B/5.077)] {G11B 5/21}
[List of Patents for class g9b subclass 5.06] 5.06           Subclass 5.06 indent level is 3 Gap features [N: ( G9B/5.052, G9B/5.055, G9B/5.068, G9B/5.075, G9B/5.156 and subgroups, G9B/5.16 and subgroups, G9B/5.168 and subgroups take precedence)] {G11B 5/23}
 [List of Patents for class g9b subclass 5.061] 5.061           Subclass 5.061 indent level is 4 Selection of material for gap filler [N: G9B/5.062 takes precedence] {G11B 5/235}
 [List of Patents for class g9b subclass 5.062] 5.062           Subclass 5.062 indent level is 4 [N: Manufacture of gap] {G11B 5/23A}
[List of Patents for class g9b subclass 5.063] 5.063           Subclass 5.063 indent level is 3 comprising means for controlling the reluctance of the magnetic circuit [N: in a head with single gap, for co-operation with one track; ( G9B/5.067 takes precedence; for plural gaps or plural tracks G9B/5.04, G9B/5.068, G9B/5.075, G9B/5.159 and subgroups)] {G11B 5/245}
 [List of Patents for class g9b subclass 5.067] 5.067           Subclass 5.067 indent level is 3 comprising means for protection against wear [N: in thin film structures G9B/5.079] {G11B 5/255}
[List of Patents for class g9b subclass 5.068] 5.068           Subclass 5.068 indent level is 2 Structure or manufacture of a head with more than one gap for erasing, recording or reproducing on the same track ( G9B/5.104 takes precedence [N: in thin film structures G9B/5.077]) {G11B 5/265}
[List of Patents for class g9b subclass 5.075] 5.075           Subclass 5.075 indent level is 2 Structure or manufacture of unitary devices formed of plural heads for more than one track [N: G9B/5.104, G9B/5.159 and subgroups take precedence; in thin film structure G9B/5.077] {G11B 5/29}
 [List of Patents for class g9b subclass 5.076] 5.076           Subclass 5.076 indent level is 3 [N: Manufacture] {G11B 5/29A}
[List of Patents for class g9b subclass 5.077] 5.077           Subclass 5.077 indent level is 2 using thin films [N: ( G9B/5.042, G9B/5.044, G9B/5.054, G9B/5.055, G9B/5.104, G9B/5.159 take precedence; magnetic thin film structures H01F10/00)] {G11B 5/31}
[List of Patents for class g9b subclass 5.078] 5.078           Subclass 5.078 indent level is 3 [N: Structure or manufacture of integrated heads or heads mechanically assembled and electrically connected to a support or housing] {G11B 5/31B}
[List of Patents for class g9b subclass 5.08] 5.08           Subclass 5.08 indent level is 3 [N: Details ( G9B/5.078 takes precedence)] {G11B 5/31D}
 [List of Patents for class g9b subclass 5.081] 5.081           Subclass 5.081 indent level is 4 [N: for improving the magnetic domain structure or avoiding the formation or displacement of undesirable magnetic domains] {G11B 5/31D2}
 [List of Patents for class g9b subclass 5.082] 5.082           Subclass 5.082 indent level is 4 [N: Shaping of layers, poles or gaps for improving the form of the electrical signal transduced, e.g. for shielding, contour effect, equalizing, side flux fringing, cross talk reduction between heads or between heads and information tracks ( G9B/5.081, G9B/5.063 take precedence)] {G11B 5/31D4}
[List of Patents for class g9b subclass 5.083] 5.083           Subclass 5.083 indent level is 4 [N: for reducing flux leakage between the electrical coil layers and the magnetic cores or poles or between the magnetic cores or poles] {G11B 5/31D6}
[List of Patents for class g9b subclass 5.084] 5.084           Subclass 5.084 indent level is 5 [N: by using special coil configurations or conductors] {G11B 5/31D6C}
 [List of Patents for class g9b subclass 5.085] 5.085           Subclass 5.085 indent level is 6 [N: using superconductors] {G11B 5/31D6C2}
[List of Patents for class g9b subclass 5.086] 5.086           Subclass 5.086 indent level is 4 [N: Disposition of layers] {G11B 5/31D8}
[List of Patents for class g9b subclass 5.094] 5.094           Subclass 5.094 indent level is 3 [N: Fabrication methods or processes specially adapted for a particular head structure, e.g. using base layers for electroplating, using functional layers for masking, using energy or particle beams for shaping the structure or modifying the properties of the basic layers] {G11B 5/31M}
[List of Patents for class g9b subclass 5.096] 5.096           Subclass 5.096 indent level is 3 [N: Structure of heads comprising at least in the transducing gap regions two magnetic thin films disposed respectively at both sides of the gaps ( G9B/5.065, G9B/5.068 take precedence; composite magnetic head structures, e.g. "Metal-In-Gap" heads are classified in G9B/5.04 or G9B/5.051 and subgroups)] {G11B 5/31P}
[List of Patents for class g9b subclass 5.1] 5.1           Subclass 5.1 indent level is 3 [N: Testing] {G11B 5/31T}
 [List of Patents for class g9b subclass 5.103] 5.103           Subclass 5.103 indent level is 2 Erasing heads using permanent magnets (general details therefor G9B/5.045 to G9B/5.067) {G11B 5/325}
[List of Patents for class g9b subclass 5.104] 5.104           Subclass 5.104 indent level is 2 Structure or manufacture of flux-sensitive heads, [N: i.e. for reproduction only; Combination of such heads with means for recording or erasing only] ([N: Single head using magnetic domains for scanning G9B/5.165; multiple head for scanning G9B/5.16 and subgroups]; general details therefor G9B/5.045 to G9B/5.067) {G11B 5/33}
 [List of Patents for class g9b subclass 5.105] 5.105           Subclass 5.105 indent level is 3 with saturated jig, e.g. for detecting second harmonic; balanced flux head {G11B 5/335}
 [List of Patents for class g9b subclass 5.106] 5.106           Subclass 5.106 indent level is 3 [N: using thin films ( G9B/5.109, G9B/5.115 take precedence)] {G11B 5/33B}
 [List of Patents for class g9b subclass 5.107] 5.107           Subclass 5.107 indent level is 3 having vibrating elements {G11B 5/35}
[List of Patents for class g9b subclass 5.108] 5.108           Subclass 5.108 indent level is 3 using galvano-magnetic devices, e.g. Hall-effect devices ( G9B/5.113 takes precedence) [N: using Hall or Hall-related effect, e.g. planar-Hall effect or pseudo-Hall effect] {G11B 5/37}
[List of Patents for class g9b subclass 5.109] 5.109           Subclass 5.109 indent level is 4 [N: in magnetic thin films] {G11B 5/37B}
 [List of Patents for class g9b subclass 5.11] 5.11           Subclass 5.11 indent level is 5 [N: Integrated structures] {G11B 5/37B2}
[List of Patents for class g9b subclass 5.111] 5.111           Subclass 5.111 indent level is 4 [N: in semi-conductors ( G9B/5.109 takes precedence)] {G11B 5/37D}
 [List of Patents for class g9b subclass 5.112] 5.112           Subclass 5.112 indent level is 5 [N: Integrated structures] {G11B 5/37D2}
[List of Patents for class g9b subclass 5.113] 5.113           Subclass 5.113 indent level is 3 using magneto-resistive devices [N: or effects] {G11B 5/39}
[List of Patents for class g9b subclass 5.114] 5.114           Subclass 5.114 indent level is 4 [N: using magnetic layers or their effects] {G11B 5/39C}
[List of Patents for class g9b subclass 5.115] 5.115           Subclass 5.115 indent level is 5 [N: layers of thin film] {G11B 5/39C2}
[List of Patents for class g9b subclass 5.116] 5.116           Subclass 5.116 indent level is 6 [N: the films being part of integrated structures] {G11B 5/39C2C}
[List of Patents for class g9b subclass 5.117] 5.117           Subclass 5.117 indent level is 7 [N: Details] {G11B 5/39C2C4}
 [List of Patents for class g9b subclass 5.118] 5.118           Subclass 5.118 indent level is 8 [N: where the active read-out elements are transducing in association with active magnetic shields, e.g. magnetically coupled shields ( G9B/5.119 takes precedence)] {G11B 5/39C2C4E}
[List of Patents for class g9b subclass 5.119] 5.119           Subclass 5.119 indent level is 8 [N: where the active read-out elements are coupled to the magnetic flux of the track by at least one magnetic thin film flux guide] {G11B 5/39C2C4G}
[List of Patents for class g9b subclass 5.123] 5.123           Subclass 5.123 indent level is 8 [N: disposition of magnetic thin films not used for directly coupling magnetic flux from the track to the MR film or for shielding] {G11B 5/39C2C4H}
[List of Patents for class g9b subclass 5.128] 5.128           Subclass 5.128 indent level is 8 [N: Heads comprising more than one sensitive element] {G11B 5/39C2C4M}
[List of Patents for class g9b subclass 5.135] 5.135           Subclass 5.135 indent level is 7 [N: composite structural arrangements of transducers, e.g. inductive write and magnetoresistive read ( G9B/5.117 takes precedence)] {G11B 5/39C2C6}
[List of Patents for class g9b subclass 5.139] 5.139           Subclass 5.139 indent level is 6 [N: specially shaped] {G11B 5/39C2D}
 [List of Patents for class g9b subclass 5.141] 5.141           Subclass 5.141 indent level is 6 [N: with intrinsic biasing, e.g. provided by equipotential strips] {G11B 5/39C2E}
 [List of Patents for class g9b subclass 5.142] 5.142           Subclass 5.142 indent level is 4 [N: in semi-conductors ( G9B/5.114 takes precedence)] {G11B 5/39D}
 [List of Patents for class g9b subclass 5.143] 5.143           Subclass 5.143 indent level is 1 Protective measures on heads, e.g. against excessive temperature ( G9B/5.077 takes precedence; protection against wear G9B/5.067) [N: protective structure of the head: see under structures, e.g. G9B/5.079] {G11B 5/40}
 [List of Patents for class g9b subclass 5.144] 5.144           Subclass 5.144 indent level is 1 Cleaning of heads [N: of record carriers G9B/23.096] {G11B 5/41}
 [List of Patents for class g9b subclass 5.145] 5.145           Subclass 5.145 indent level is 1 Arrangements for functional testing of heads [N: (testing of the manufacturing process G9B/5.04)]; Measuring arrangements for heads (measuring electric or magnetic properties G01R; [N: measuring properties for shaping or assembling elements G9B/5.04]) [C9511] {G11B 5/455}
 [List of Patents for class g9b subclass 5.146] 5.146           Subclass 5.146 indent level is 1 Arrangements for demagnetisation of heads (demagnetisation in general H01F13/00) [C9511] {G11B 5/465}
[List of Patents for class g9b subclass 5.147] 5.147           Subclass 5.147 indent level is 1 Disposition or mounting of heads [N: or head supports] relative to record carriers [N: mounting of head within housing G9B/5.035; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed (driving of both record carriers and head G9B/15.021; guiding record carriers G9B/15.076; head selecting circuits G9B/15.016)] {G11B 5/48}
[List of Patents for class g9b subclass 5.148] 5.148           Subclass 5.148 indent level is 2 [N: specially adapted for disk drive assemblies, e.g. assembly prior to operation, hard or flexible disk drives ( G9B/5.156 to G9B/5.181 take precedence)] [N9605] {G11B 5/48A}
[List of Patents for class g9b subclass 5.156] 5.156           Subclass 5.156 indent level is 2 [N: Disposition of heads ( G9B/5.159, G9B/5.173 take precedence)] {G11B 5/48D}
 [List of Patents for class g9b subclass 5.157] 5.157           Subclass 5.157 indent level is 3 [N: relative to rotating disc] {G11B 5/48D1}
 [List of Patents for class g9b subclass 5.158] 5.158           Subclass 5.158 indent level is 3 [N: relative to moving tape] {G11B 5/48D2}
[List of Patents for class g9b subclass 5.159] 5.159           Subclass 5.159 indent level is 2 Fixed mounting [N: or arrangements, e.g. one head per track] {G11B 5/49}
[List of Patents for class g9b subclass 5.16] 5.16           Subclass 5.16 indent level is 3 [N: Details for scanning ( G9B/5.168 takes precedence)] {G11B 5/49S}
[List of Patents for class g9b subclass 5.168] 5.168           Subclass 5.168 indent level is 3 [N: Details for track selection or addressing] {G11B 5/49T}
 [List of Patents for class g9b subclass 5.169] 5.169           Subclass 5.169 indent level is 4 [N: Disposition of heads, e.g. matrix arrangement] {G11B 5/49T2}
 [List of Patents for class g9b subclass 5.17] 5.17           Subclass 5.17 indent level is 4 [N: Structure of specially adapted switching heads ( G9B/5.132 takes precedence)] {G11B 5/49T4}
 [List of Patents for class g9b subclass 5.171] 5.171           Subclass 5.171 indent level is 4 [N: Circuits] {G11B 5/49T6}
 [List of Patents for class g9b subclass 5.172] 5.172           Subclass 5.172 indent level is 2 Interchangeable mountings, e.g. for replacement of head without readjustment {G11B 5/50}
[List of Patents for class g9b subclass 5.173] 5.173           Subclass 5.173 indent level is 2 with simultaneous movement of head and record carrier, e.g. rotation of head ( G9B/5.204 takes precedence) {G11B 5/52}
[List of Patents for class g9b subclass 5.181] 5.181           Subclass 5.181 indent level is 2 with provision for moving the head into or out of its operative position or across tracks ( G9B/5.202 takes precedence) {G11B 5/54}
[List of Patents for class g9b subclass 5.182] 5.182           Subclass 5.182 indent level is 3 Track change, selection or acquisition by displacement of the head {G11B 5/55}
[List of Patents for class g9b subclass 5.183] 5.183           Subclass 5.183 indent level is 4 [N: across tape tracks] {G11B 5/55B}
 [List of Patents for class g9b subclass 5.184] 5.184           Subclass 5.184 indent level is 5 [N: Control circuits therefor ( G9B/5.185 takes precedence)] {G11B 5/55B1}
[List of Patents for class g9b subclass 5.185] 5.185           Subclass 5.185 indent level is 4 [N: Specially adapted for transducing in both travelling directions of tape] {G11B 5/55C}
[List of Patents for class g9b subclass 5.187] 5.187           Subclass 5.187 indent level is 4 [N: across disc tracks (spiral track following G9B/5.216)] {G11B 5/55D}
 [N: Note
 For groups G9B/5.188 to G9B/5.198, see provisionally G9B/5.187 and G9B/5.216]
 
[List of Patents for class g9b subclass 5.199] 5.199           Subclass 5.199 indent level is 4 [N: across drum tracks] {G11B 5/55T}
 [List of Patents for class g9b subclass 5.2] 5.2           Subclass 5.2 indent level is 5 [N: Control circuits therefor] {G11B 5/55T1}
 [List of Patents for class g9b subclass 5.201] 5.201           Subclass 5.201 indent level is 2 with provision for moving the head [N: support] for the purpose of adjusting the position of the head relative to the record carrier, e.g. manual adjustment for azimuth correction or track centering ( G9B/5.173, G9B/5.181, G9B/5.202 take precedence) {G11B 5/56}
[List of Patents for class g9b subclass 5.202] 5.202           Subclass 5.202 indent level is 2 with provision for moving the head for the purpose of maintaining alignment of the head relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following [N: spacing means incorporated in the head structure G9B/5.051, G9B/5.067, G9B/5.079] {G11B 5/58}
[List of Patents for class g9b subclass 5.203] 5.203           Subclass 5.203 indent level is 3 for track following on tapes {G11B 5/584}
 [List of Patents for class g9b subclass 5.204] 5.204           Subclass 5.204 indent level is 4 by controlling the position of the rotating heads (by controlling the speed of the record carrier G9B/15.055; by controlling speed of the heads G9B/15.064; [N: by moving the transducing part of the head relative to the headwheel, in the direction of the scanning movement G9B/15.026]) {G11B 5/588}
[List of Patents for class g9b subclass 5.205] 5.205           Subclass 5.205 indent level is 3 [N: maintaining desired contact or spacing by direct interaction of forces generated between heads or supports thereof and record carriers or supports thereof, e.g. attraction-repulsion interactions] {G11B 5/58A}
[List of Patents for class g9b subclass 5.216] 5.216           Subclass 5.216 indent level is 3 for track following on disks [N: ( G9B/5.188, G9B/5.193, G9B/5.196, G9B/5.198 take precedence)] {G11B 5/596}
 [N: Note
 For groups G9B/5.217 to G9B/5.222, see provisionally G9B/5.187 and G9B/5.216]
 
[List of Patents for class g9b subclass 5.217] 5.217           Subclass 5.217 indent level is 4 [N: Circuits ( G9B/5.221 to G9B/5.228 take precedence)] [C9704] {G11B 5/596C}
 [List of Patents for class g9b subclass 5.218] 5.218           Subclass 5.218 indent level is 5 [N: Detection or processing of peak/envelop signals] [N9704] {G11B 5/596C1}
 [List of Patents for class g9b subclass 5.219] 5.219           Subclass 5.219 indent level is 5 [N: Synchronisation; Clocking ( G9B/5.22 takes precedence)] [N9704] {G11B 5/596C3}
 [List of Patents for class g9b subclass 5.22] 5.22           Subclass 5.22 indent level is 5 [N: Gain control; Filters] [N9704] {G11B 5/596C5}
 [List of Patents for class g9b subclass 5.221] 5.221           Subclass 5.221 indent level is 4 [N: Aligning for runout, eccentricity or offset compensation ( G9B/5.19, G9B/5.226, G9B/5.228 take precedence)] [N9704] {G11B 5/596E}
[List of Patents for class g9b subclass 5.222] 5.222           Subclass 5.222 indent level is 4 [N: Servo formatting ( G9B/5.221, G9B/5.226, G9B/5.227, G9B/5.228 take precedence)] [C9704] {G11B 5/596F}
 [List of Patents for class g9b subclass 5.223] 5.223           Subclass 5.223 indent level is 5 [N: Acquisition or selection of servo format from a system reference (after track seek G9B/5.194)] {G11B 5/596F2}
 [List of Patents for class g9b subclass 5.224] 5.224           Subclass 5.224 indent level is 5 [N: Embedded servo format ( G9B/5.225 takes precedence)] [N9704] {G11B 5/596F4}
 [List of Patents for class g9b subclass 5.225] 5.225           Subclass 5.225 indent level is 5 [N: Sector, sample or burst servo format] [N9704] {G11B 5/596F5}
 [List of Patents for class g9b subclass 5.226] 5.226           Subclass 5.226 indent level is 4 [N: with optical servo tracking] [N9704] {G11B 5/596L}
 [List of Patents for class g9b subclass 5.227] 5.227           Subclass 5.227 indent level is 4 [N: for magnetoresistive heads] [N9704] {G11B 5/596M}
 [List of Patents for class g9b subclass 5.228] 5.228           Subclass 5.228 indent level is 4 [N: Servo signal format patterns or signal processing thereof, e.g. dual, tri, quad, burst signal patterns] [N9704] {G11B 5/596P}
[List of Patents for class g9b subclass 5.229] 5.229           Subclass 5.229 indent level is 3 Fluid-dynamic spacing of heads form record-carriers {G11B 5/60}
[List of Patents for class g9b subclass 5.233] 5.233           Subclass 5.233 indent level is 1 Record carriers characterised by the selection of the material (selection of magnetic materials in general H01F1/00; thin magnetic films H01F10/00) {G11B 5/62}
 Note
 This group does not cover compositions, materials or processes, per se, which are covered by the relevant subclasses of section B or C.
 
 [List of Patents for class g9b subclass 5.234] 5.234           Subclass 5.234 indent level is 2 of leaders for magnetic tapes e.g. non-magnetic strips on the tapes or for connection (constructional features G9B/23.086) {G11B 5/627}
 [List of Patents for class g9b subclass 5.235] 5.235           Subclass 5.235 indent level is 2 of cinematographic films or slides with integral magnetic track {G11B 5/633}
[List of Patents for class g9b subclass 5.236] 5.236           Subclass 5.236 indent level is 2 Comprising only the magnetisable material without bonding agent {G11B 5/64}
 [List of Patents for class g9b subclass 5.237] 5.237           Subclass 5.237 indent level is 3 [N: self supporting magnetisable material, e.g. magnetisable wires] {G11B 5/64C}
[List of Patents for class g9b subclass 5.238] 5.238           Subclass 5.238 indent level is 3 [N: characterised by the film material] {G11B 5/64D}
 [List of Patents for class g9b subclass 5.239] 5.239           Subclass 5.239 indent level is 4 [N: containing Fe or Ni ( G9B/5.24 takes precedence)] {G11B 5/64D2}
 [List of Patents for class g9b subclass 5.24] 5.24           Subclass 5.24 indent level is 4 [N: containing CO] {G11B 5/64D3}
 [List of Patents for class g9b subclass 5.241] 5.241           Subclass 5.241 indent level is 3 consisting of several layers {G11B 5/66}
[List of Patents for class g9b subclass 5.242] 5.242           Subclass 5.242 indent level is 2 comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent {G11B 5/68}
[List of Patents for class g9b subclass 5.243] 5.243           Subclass 5.243 indent level is 3 on a base layer {G11B 5/70}
[List of Patents for class g9b subclass 5.244] 5.244           Subclass 5.244 indent level is 4 characterised by the bonding agent {G11B 5/702}
[List of Patents for class g9b subclass 5.245] 5.245           Subclass 5.245 indent level is 5 [N: containing a polyurethane or a polyisocyanate] {G11B 5/702B}
 [List of Patents for class g9b subclass 5.247] 5.247           Subclass 5.247 indent level is 5 [N: containing polyesters, polyethers, silicones, polyvinyl resins, polyacrylresins or epoxy resins ( G9B/5.246 takes precedence)] {G11B 5/702C}
 [List of Patents for class g9b subclass 5.248] 5.248           Subclass 5.248 indent level is 5 [N: containing cellulosic derivates ( G9B/5.246 takes precedence)] {G11B 5/702D}
 [List of Patents for class g9b subclass 5.249] 5.249           Subclass 5.249 indent level is 5 [N: Radiation curable polymers] {G11B 5/702E}
 [List of Patents for class g9b subclass 5.25] 5.25           Subclass 5.25 indent level is 5 [N: Graft polymers] {G11B 5/702F}
 [List of Patents for class g9b subclass 5.251] 5.251           Subclass 5.251 indent level is 5 [N: Additives, e.g. crosslinking agents] {G11B 5/702G}
[List of Patents for class g9b subclass 5.252] 5.252           Subclass 5.252 indent level is 4 characterised by the composition of the magnetic material {G11B 5/706}
[List of Patents for class g9b subclass 5.253] 5.253           Subclass 5.253 indent level is 5 [N: metals or alloys] {G11B 5/706B}
 [List of Patents for class g9b subclass 5.254] 5.254           Subclass 5.254 indent level is 6 [N: with a non-magnetic core] {G11B 5/706B2}
 [List of Patents for class g9b subclass 5.255] 5.255           Subclass 5.255 indent level is 6 [N: containing Fe metal or alloys ( G9B/5.256 takes precedence)] {G11B 5/706B4}
 [List of Patents for class g9b subclass 5.256] 5.256           Subclass 5.256 indent level is 6 [N: containing Co metal or alloys] {G11B 5/706B6}
[List of Patents for class g9b subclass 5.257] 5.257           Subclass 5.257 indent level is 5 [N: containing non-metallic substances] {G11B 5/706C}
 [List of Patents for class g9b subclass 5.258] 5.258           Subclass 5.258 indent level is 6 [N: with a non-magnetic core] {G11B 5/706C2}
 [List of Patents for class g9b subclass 5.259] 5.259           Subclass 5.259 indent level is 6 [N: CrO2] {G11B 5/706C4}
[List of Patents for class g9b subclass 5.26] 5.26           Subclass 5.26 indent level is 6 [N: iron oxides] {G11B 5/706C6}
 [List of Patents for class g9b subclass 5.261] 5.261           Subclass 5.261 indent level is 7 [N: with a skin ( G9B/5.263 takes precedence)] {G11B 5/706C6B}
[List of Patents for class g9b subclass 5.262] 5.262           Subclass 5.262 indent level is 7 [N: gamma - Fe2 O3] {G11B 5/706C6C}
 [List of Patents for class g9b subclass 5.263] 5.263           Subclass 5.263 indent level is 8 [N: with a skin] {G11B 5/706C6C1}
 [List of Patents for class g9b subclass 5.264] 5.264           Subclass 5.264 indent level is 8 [N: Preparation processes specially adapted therefor, e.g. using stabilising agents ( G9B/5.265 and G9B/5.266 take precedence)] {G11B 5/706C6C2}
[List of Patents for class g9b subclass 5.265] 5.265           Subclass 5.265 indent level is 8 [N: containing a dopant] {G11B 5/706C6C3}
 [List of Patents for class g9b subclass 5.266] 5.266           Subclass 5.266 indent level is 9 [N: containing Co] {G11B 5/706C6C3B}
[List of Patents for class g9b subclass 5.267] 5.267           Subclass 5.267 indent level is 7 [N: Ferrites] {G11B 5/706C6D}
[List of Patents for class g9b subclass 5.268] 5.268           Subclass 5.268 indent level is 8 [N: Ferro-ferrioxydes] {G11B 5/706C6D2}
 [List of Patents for class g9b subclass 5.269] 5.269           Subclass 5.269 indent level is 9 [N: Magnetite] {G11B 5/706C6D2B}
 [List of Patents for class g9b subclass 5.27] 5.27           Subclass 5.27 indent level is 9 [N: Non-stoechiometric ferro-ferrioxydes, e.g. berthollide] {G11B 5/706C6D2C}
[List of Patents for class g9b subclass 5.271] 5.271           Subclass 5.271 indent level is 4 characterised by addition of non-magnetic particles to the layer {G11B 5/708}
 [List of Patents for class g9b subclass 5.272] 5.272           Subclass 5.272 indent level is 5 [N: non-magnetic abrasive particles] {G11B 5/708B}
 [List of Patents for class g9b subclass 5.273] 5.273           Subclass 5.273 indent level is 4 [N: comprising a magnetic layer on both sides covered with non-magnetic material] {G11B 5/70L}
 [List of Patents for class g9b subclass 5.274] 5.274           Subclass 5.274 indent level is 4 [N: characterised by the dispersing agent] {G11B 5/70M}
 [List of Patents for class g9b subclass 5.275] 5.275           Subclass 5.275 indent level is 4 characterised by the lubricant {G11B 5/71}
 [List of Patents for class g9b subclass 5.276] 5.276           Subclass 5.276 indent level is 4 characterised by the surface treatment or coating of magnetic particles {G11B 5/712}
 [List of Patents for class g9b subclass 5.277] 5.277           Subclass 5.277 indent level is 4 characterised by the dimension of the magnetic particles {G11B 5/714}
[List of Patents for class g9b subclass 5.278] 5.278           Subclass 5.278 indent level is 4 characterised by two or more magnetic layers {G11B 5/716}
 [List of Patents for class g9b subclass 5.279] 5.279           Subclass 5.279 indent level is 5 at least one on each side of the base layer {G11B 5/718}
[List of Patents for class g9b subclass 5.28] 5.28           Subclass 5.28 indent level is 2 Protective coatings, e.g. antistatic, antifriction {G11B 5/72}
 [List of Patents for class g9b subclass 5.281] 5.281           Subclass 5.281 indent level is 3 containing a lubricant [N0503] {G11B 5/725}
 [List of Patents for class g9b subclass 5.282] 5.282           Subclass 5.282 indent level is 3 [N: containing an anticorrosive material] {G11B 5/72C}
[List of Patents for class g9b subclass 5.283] 5.283           Subclass 5.283 indent level is 2 Base layers [N0503] {G11B 5/73}
[List of Patents for class g9b subclass 5.289] 5.289           Subclass 5.289 indent level is 1 Record carriers characterised by the form, e.g. sheet shaped to wrap around a drum {G11B 5/74}
 [List of Patents for class g9b subclass 5.29] 5.29           Subclass 5.29 indent level is 2 Drum carriers {G11B 5/76}
 [List of Patents for class g9b subclass 5.291] 5.291           Subclass 5.291 indent level is 2 Tape carriers {G11B 5/78}
 [List of Patents for class g9b subclass 5.292] 5.292           Subclass 5.292 indent level is 2 Card carriers {G11B 5/80}
[List of Patents for class g9b subclass 5.293] 5.293           Subclass 5.293 indent level is 2 Disc carriers {G11B 5/82}
 [List of Patents for class g9b subclass 5.294] 5.294           Subclass 5.294 indent level is 3 [N: flexible discs] {G11B 5/82D}
[List of Patents for class g9b subclass 5.295] 5.295           Subclass 5.295 indent level is 1 Processes or apparatus specially adapted for manufacturing record carriers (processes involving a single technical art, in general, and for which provision exists elsewhere, see the relevant places, e.g. B29, C23, C25D; apparatus or processes for applying homogeneous magnetic films to substrates in general H01F41/14) {G11B 5/84}
[List of Patents for class g9b subclass 5.296] 5.296           Subclass 5.296 indent level is 2 Coating a support with a liquid magnetic dispersion {G11B 5/842}
 [List of Patents for class g9b subclass 5.297] 5.297           Subclass 5.297 indent level is 3 in a magnetic field {G11B 5/845}
 [List of Patents for class g9b subclass 5.298] 5.298           Subclass 5.298 indent level is 2 Coating a support with a magnetic layer by extrusion {G11B 5/848}
 [List of Patents for class g9b subclass 5.299] 5.299           Subclass 5.299 indent level is 2 [N: manufacturing base layers] {G11B 5/84B}
 [List of Patents for class g9b subclass 5.3] 5.3           Subclass 5.3 indent level is 2 [N: protecting the magnetic layer] {G11B 5/84C}
 [List of Patents for class g9b subclass 5.301] 5.301           Subclass 5.301 indent level is 2 [N: treatment by ultrasonics] {G11B 5/84E}
 [List of Patents for class g9b subclass 5.302] 5.302           Subclass 5.302 indent level is 2 [N: coating a support with a magnetic layer by precipitation] {G11B 5/84H}
 [List of Patents for class g9b subclass 5.303] 5.303           Subclass 5.303 indent level is 2 Coating a support with a magnetic layer by vapour deposition {G11B 5/85}
 [List of Patents for class g9b subclass 5.304] 5.304           Subclass 5.304 indent level is 2 Coating a support with a magnetic layer by sputtering [N0503] {G11B 5/851}
 [List of Patents for class g9b subclass 5.305] 5.305           Subclass 5.305 indent level is 2 Orientation in a magnetic field ( G9B/5.297 takes precedence) {G11B 5/852}
 [List of Patents for class g9b subclass 5.306] 5.306           Subclass 5.306 indent level is 2 Coating only part of a support with a magnetic layer {G11B 5/855}
 [List of Patents for class g9b subclass 5.307] 5.307           Subclass 5.307 indent level is 2 Producing a magnetic layer by electro-plating or electroless plating {G11B 5/858}
[List of Patents for class g9b subclass 5.308] 5.308           Subclass 5.308 indent level is 1 Re-recording, i.e. transcribing information from one magnetisable record carrier on to one or more similar or dissimilar record carriers [N: (by varying the order of the information G9B/27.009, G9B/27.013)] {G11B 5/86}
 [List of Patents for class g9b subclass 5.309] 5.309           Subclass 5.309 indent level is 2 [N: by contact "printing"] {G11B 5/86B}
[List of Patents for class g9b subclass 7] 7           Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation [N: by modifying optical properties or the physical structure], reproducing using an optical beam at lower power [N: by sensing optical properties]; Record carriers therefor; ( G9B/11, G9B/13 take precedence) [C0406]{G11B 7/00}
[List of Patents for class g9b subclass 7.001] 7.001           Subclass 7.001 indent level is 1 Recording, reproducing or erasing systems characterised by the shape [N: or form] of the carrier [N0406] {G11B 7/002}
 [List of Patents for class g9b subclass 7.002] 7.002           Subclass 7.002 indent level is 2 with cylinders or cylinder-like carriers [N: or cylindrical sections or flat carriers loaded onto a cylindrical surface], e.g. truncated cones [N0406] {G11B 7/0025}
 [List of Patents for class g9b subclass 7.003] 7.003           Subclass 7.003 indent level is 2 with webs [N: , filaments or wires], e.g. belts, spooled tapes or films of quasi-infinite extent [N0406] {G11B 7/003}
 [List of Patents for class g9b subclass 7.004] 7.004           Subclass 7.004 indent level is 2 with cards [N: or other card-like flat carriers, e.g. flat sheets of optical film] [N0406] {G11B 7/0033}
[List of Patents for class g9b subclass 7.005] 7.005           Subclass 7.005 indent level is 2 with discs [N0406] {G11B 7/0037}
[List of Patents for class g9b subclass 7.009] 7.009           Subclass 7.009 indent level is 1 Recording, reproducing or erasing methods; Read, write or erase circuits therefor [N: (magneto-optical systems G9B/11.009)] [N0406] {G11B 7/004}
[List of Patents for class g9b subclass 7.01] 7.01           Subclass 7.01 indent level is 2 Recording (G9B/7.026. G9B/7.027 take precedence) [N0406] {G11B 7/0045}
 [List of Patents for class g9b subclass 7.011] 7.011           Subclass 7.011 indent level is 3 [N: involving ablation of the recording layer] [N0406] {G11B 7/0045A}
 [List of Patents for class g9b subclass 7.012] 7.012           Subclass 7.012 indent level is 3 [N: involving bubble or bump forming] [N0406] {G11B 7/0045H}
 [List of Patents for class g9b subclass 7.013] 7.013           Subclass 7.013 indent level is 3 [N: involving spectral or photochemical hole burning] [N0406] {G11B 7/0045M}
 [List of Patents for class g9b subclass 7.014] 7.014           Subclass 7.014 indent level is 3 [N: involving phase-change effects] [N0406] {G11B 7/0045P}
 [List of Patents for class g9b subclass 7.015] 7.015           Subclass 7.015 indent level is 3 [N: involving reflectivity, absorption or colour changes] [N0406] {G11B 7/0045R}
 [List of Patents for class g9b subclass 7.016] 7.016           Subclass 7.016 indent level is 3 [N: Recording strategies, e.g. pulse sequences ( G9B/7.028 takes precedence)] [N0408] {G11B 7/0045S}
 [N: WARNING
 [N0408]
 Not complete, see also G9B/7.01, G9B/7.026 and G9B/7.103]
 
 [List of Patents for class g9b subclass 7.017] 7.017           Subclass 7.017 indent level is 3 [N: Verification, i.e. checking data during or after recording] [N0408] {G11B 7/0045V}
 [N: WARNING
 [N0408]
 Not complete, see also G9B/7.01 and G9B/7.018]
 
 [List of Patents for class g9b subclass 7.018] 7.018           Subclass 7.018 indent level is 2 Reproducing ( G9B/7.027 takes precedence) [N0406] {G11B 7/005}
[List of Patents for class g9b subclass 7.019] 7.019           Subclass 7.019 indent level is 2 Erasing ( G9B/7.026, G9B/7.027 take precedence) [N0406] {G11B 7/0055}
 [List of Patents for class g9b subclass 7.02] 7.02           Subclass 7.02 indent level is 3 [N: involving colour change media] [N0406] {G11B 7/0055C}
 [List of Patents for class g9b subclass 7.021] 7.021           Subclass 7.021 indent level is 3 [N: involving liquid crystal media] [N0406] {G11B 7/0055L}
 [List of Patents for class g9b subclass 7.022] 7.022           Subclass 7.022 indent level is 3 [N: involving phase-change media] [N0406] {G11B 7/0055P}
 [List of Patents for class g9b subclass 7.023] 7.023           Subclass 7.023 indent level is 3 [N: involving phase depth effects] [N0406] {G11B 7/005P}
 [List of Patents for class g9b subclass 7.024] 7.024           Subclass 7.024 indent level is 3 [N: involving reflectivity, absorption or colour changes] [N0406] {G11B 7/005R}
 [List of Patents for class g9b subclass 7.025] 7.025           Subclass 7.025 indent level is 3 [N: Reproducing non-user data, e.g. wobbled address, prepits, BCA] [N0408] {G11B 7/005W}
 [N: WARNING
 [N0408]
 Not complete, see also G9B/7.018]
 
 [List of Patents for class g9b subclass 7.026] 7.026           Subclass 7.026 indent level is 2 Overwriting ( G9B/7.027 takes precedence) [N0406] {G11B 7/006}
[List of Patents for class g9b subclass 7.027] 7.027           Subclass 7.027 indent level is 2 Recording, reproducing or erasing by using optical interference patterns, e.g. holograms [N0406] {G11B 7/0065}
[List of Patents for class g9b subclass 7.029] 7.029           Subclass 7.029 indent level is 1 Arrangement of the information on the record carrier, e.g. form of tracks [N: actual track shape, (e.g. wobbled) or cross-section, (e.g. v-shaped); sequential information structures, (e.g. sectoring or header formats within a track] {G11B 7/007}
 [List of Patents for class g9b subclass 7.03] 7.03           Subclass 7.03 indent level is 2 [N: Dimensions of grooves or tracks, e.g. groove depth, track pitch] [N0408] {G11B 7/007D}
 [N: WARNING
 [N0408]
 Not complete, see also G9B/7.029]
 
 [List of Patents for class g9b subclass 7.031] 7.031           Subclass 7.031 indent level is 2 [N: Groove and land recording, i.e. user data recorded both in the grooves and on the lands] [N0408] {G11B 7/007G}
 [List of Patents for class g9b subclass 7.032] 7.032           Subclass 7.032 indent level is 2 [N: where the information is modified to form a visible pattern, e.g. forming a label by modifying the width of pits or grooves] [N0408] {G11B 7/007L}
 [N: WARNING
 [N0408]
 Not complete, see also G9B/7.029 and G9B/7.139]
 
 [List of Patents for class g9b subclass 7.033] 7.033           Subclass 7.033 indent level is 2 [N: Auxiliary data, e.g. lead-in, lead-out, Power Calibration Area (PCA), Burst Cutting Area (BCA), control information (sector headers or adresses in prepits G9B/7.034; address data in track wobble G9B/7.035)] [N0408] {G11B 7/007R}
 [N: WARNING
 [N0408]
 Not complete, see also G9B/7.029 and G9B/7.034]
 
 [List of Patents for class g9b subclass 7.034] 7.034           Subclass 7.034 indent level is 2 [N: Sectoring or header formats within a track (formats in general G9B/20.015)] {G11B 7/007S}
 [List of Patents for class g9b subclass 7.035] 7.035           Subclass 7.035 indent level is 2 [N: Track shape, e.g. address or synchronisation information in wobbled track or sidewall (addressing or synchronisation in general G9B/27)] [N0408] {G11B 7/007T}
 [N: WARNING
 [N0408]
 Not complete, see also G9B/7.029]
 
 [List of Patents for class g9b subclass 7.036] 7.036           Subclass 7.036 indent level is 2 [N: Track cross-section, e.g. V-shaped, trapezoidal] [N0408] {G11B 7/007V}
 [N: WARNING
 [N0408]
 Not complete, see also G9B/7.029]
 
 [List of Patents for class g9b subclass 7.037] 7.037           Subclass 7.037 indent level is 2 [N: Zoned data area, e.g. having different data structures or formats for the user data within data layer, Zone Constant Linear Velocity (ZCLV), Zone Constant Angular Velocity (ZCAV), carriers with RAM and ROM areas] [N0408] {G11B 7/007Z}
 [N: WARNING
 [N0408]
 Not complete, see also G9B/7.029]
 
[List of Patents for class g9b subclass 7.038] 7.038           Subclass 7.038 indent level is 2 for discrete information, i.e. where each information unit is stored at a distinct discrete location [N: e.g. digital information formats within a data block or sector] {G11B 7/013}
[List of Patents for class g9b subclass 7.041] 7.041           Subclass 7.041 indent level is 1 Disposition or mounting of heads or light sources relatively to record carriers {G11B 7/08}
[List of Patents for class g9b subclass 7.042] 7.042           Subclass 7.042 indent level is 2 with provision for moving the light beam into, or out of, its operative position [N: or across tracks, otherwise than during the transducing operation, e.g. for adjustment or preliminary positioning or track change or selection] (modulating by information signals G9B/7.097; controlling the position or direction of light beams, i.e. deflection, G02F1/29) {G11B 7/085}
[List of Patents for class g9b subclass 7.043] 7.043           Subclass 7.043 indent level is 3 [N: Methods for track change, selection or preliminary positioning by moving the head] {G11B 7/085A}
[List of Patents for class g9b subclass 7.05] 7.05           Subclass 7.05 indent level is 3 [N: Arrangements for positioning the light beam only without moving the head, e.g. using static electro-optical elements] {G11B 7/085B}
 [List of Patents for class g9b subclass 7.051] 7.051           Subclass 7.051 indent level is 4 [N: using electro-optical elements] {G11B 7/085B1}
 [List of Patents for class g9b subclass 7.052] 7.052           Subclass 7.052 indent level is 4 [N: using acousto-optical elements] {G11B 7/085B2}
 [List of Patents for class g9b subclass 7.053] 7.053           Subclass 7.053 indent level is 4 [N: using galvanomirrors] {G11B 7/085B3}
[List of Patents for class g9b subclass 7.054] 7.054           Subclass 7.054 indent level is 3 [N: Arrangements for mechanically moving the whole head] {G11B 7/085H}
 [List of Patents for class g9b subclass 7.059] 7.059           Subclass 7.059 indent level is 2 [N: for time base error correction by moving the light beam] {G11B 7/08A}
 [List of Patents for class g9b subclass 7.06] 7.06           Subclass 7.06 indent level is 2 [N: Details of mobile parts, e.g. electromechanical control devices (see WARNING 4 after subclass title)] {G11B 7/08D}
 [List of Patents for class g9b subclass 7.061] 7.061           Subclass 7.061 indent level is 2 [N: Aligning the head or the light source relative to the record carrier otherwise than during transducing, e.g. adjusting tilt set screw during assembly of head] [N0408] {G11B 7/08T}
 [N: WARNING
 [N0408]
 Not complete, see also G9B/7.138]
 
[List of Patents for class g9b subclass 7.062] 7.062           Subclass 7.062 indent level is 2 with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following [N: see {G11B 7/09}
 WARNING 4 after subclass title]
 
[List of Patents for class g9b subclass 7.063] 7.063           Subclass 7.063 indent level is 3 specially adapted for discs, e.g. for compensation of eccentricity or wobble {G11B 7/095}
[List of Patents for class g9b subclass 7.066] 7.066           Subclass 7.066 indent level is 3 [N: for track following only( G9B/7.079, G9B/7.089, G9B/7.091, G9B/7.092, G9B/7.093, G9B/7.094, G9B/7.095 take precedence)] {G11B 7/09A}
 [List of Patents for class g9b subclass 7.067] 7.067           Subclass 7.067 indent level is 4 [N: Multi-beam tracking systems] {G11B 7/09A2}
 [List of Patents for class g9b subclass 7.068] 7.068           Subclass 7.068 indent level is 4 [N: Dithered tracking systems] {G11B 7/09A4}
 [List of Patents for class g9b subclass 7.069] 7.069           Subclass 7.069 indent level is 4 [N: Differential phase difference systems] [N0408] {G11B 7/09A6}
[List of Patents for class g9b subclass 7.07] 7.07           Subclass 7.07 indent level is 3 [N: for focusing only ( G9B/7.079, G9B/7.089, G9B/7.091, G9B/7.092, G9B/7.093, G9B/7.094, G9B/7.095 take precedence)] {G11B 7/09B}
 [List of Patents for class g9b subclass 7.071] 7.071           Subclass 7.071 indent level is 4 [N: by astigmatic methods] {G11B 7/09B2}
 [List of Patents for class g9b subclass 7.072] 7.072           Subclass 7.072 indent level is 4 [N: by far-field method] {G11B 7/09B3}
 [List of Patents for class g9b subclass 7.073] 7.073           Subclass 7.073 indent level is 4 [N: by push-pull method] {G11B 7/09B4}
 [List of Patents for class g9b subclass 7.074] 7.074           Subclass 7.074 indent level is 4 [N: by non-optical methods, e.g. capacitive] {G11B 7/09B5}
 [List of Patents for class g9b subclass 7.075] 7.075           Subclass 7.075 indent level is 4 [N: Foucault or knife-edge methods] [N0408] {G11B 7/09B6}
 [List of Patents for class g9b subclass 7.076] 7.076           Subclass 7.076 indent level is 4 [N: Focus-error methods other than those covered by G9B/7.071 to G9B/7.075] [N0408] {G11B 7/09B8}
[List of Patents for class g9b subclass 7.077] 7.077           Subclass 7.077 indent level is 3 [N: Servo circuits using a special characteristic or response (see {G11B 7/09C}
 WARNING 4 after the subclass title)] [C9807]
 
[List of Patents for class g9b subclass 7.079] 7.079           Subclass 7.079 indent level is 3 [N: Electromechanical actuators for lens positioning ( G9B/7.054 takes precedence)] {G11B 7/09D}
 [List of Patents for class g9b subclass 7.08] 7.08           Subclass 7.08 indent level is 4 [N: for focusing only ( G9B/7.086 takes precedence)] {G11B 7/09D1}
 [List of Patents for class g9b subclass 7.081] 7.081           Subclass 7.081 indent level is 4 [N: for tracking only ( G9B/7.086 takes precedence)] {G11B 7/09D2}
 [List of Patents for class g9b subclass 7.082] 7.082           Subclass 7.082 indent level is 4 [N: for focusing and tracking ( G9B/7.083 to G9B/7.086 take precedence)] [C0408] {G11B 7/09D3}
 [List of Patents for class g9b subclass 7.083] 7.083           Subclass 7.083 indent level is 4 [N: Details of sprung supports] {G11B 7/09D4}
 [List of Patents for class g9b subclass 7.084] 7.084           Subclass 7.084 indent level is 4 [N: Details of stationary parts] {G11B 7/09D5}
 [List of Patents for class g9b subclass 7.085] 7.085           Subclass 7.085 indent level is 4 [N: Details of the moving parts] {G11B 7/09D6}
 [List of Patents for class g9b subclass 7.086] 7.086           Subclass 7.086 indent level is 4 [N: Piezo-electric actuators] {G11B 7/09D7}
 [List of Patents for class g9b subclass 7.087] 7.087           Subclass 7.087 indent level is 3 [N: optical elements specially used for improving or allowing a desired servo operation ( G9B/7.09 takes precedence; see WARNING 4 after subclass title] {G11B 7/09E}
 [List of Patents for class g9b subclass 7.088] 7.088           Subclass 7.088 indent level is 3 [N: servo format, e.g. guide tracks, pilot signals] {G11B 7/09F}
 [List of Patents for class g9b subclass 7.089] 7.089           Subclass 7.089 indent level is 3 [N: Methods and circuits for servo offset compensation] {G11B 7/09G}
 [List of Patents for class g9b subclass 7.09] 7.09           Subclass 7.09 indent level is 3 [N: Disposition of servo head, e.g. servo beam, servo detector (see {G11B 7/09H}
 WARNING 4 after subclass title)]
 
 [List of Patents for class g9b subclass 7.091] 7.091           Subclass 7.091 indent level is 3 [N: Methods and circuits for servo gain or phase compensation during operation (for initialising servos G9B/7.093)] {G11B 7/09K}
 [List of Patents for class g9b subclass 7.092] 7.092           Subclass 7.092 indent level is 3 [N: Methods and circuits for performing mathematical operations on individual detector segment outputs] {G11B 7/09L}
 [List of Patents for class g9b subclass 7.093] 7.093           Subclass 7.093 indent level is 3 [N: Methods for initialising servos, start-up sequences] {G11B 7/09M}
 [List of Patents for class g9b subclass 7.094] 7.094           Subclass 7.094 indent level is 3 [N: specially adapted for operation during external perturbations not related to the carrier or servo beam, e.g. vibration] {G11B 7/09P}
 [List of Patents for class g9b subclass 7.095] 7.095           Subclass 7.095 indent level is 3 [N: specially adapted for detection and avoidance or compensation of imperfections on the carrier, e.g. dust, scratches, dropouts ( G9B/7.063 takes precedence)] {G11B 7/09Q}
 [List of Patents for class g9b subclass 7.096] 7.096           Subclass 7.096 indent level is 2 Interchangeable mountings, e.g. for replacement of head without readjustment [N: including interchangeable electrical adjuster boards] {G11B 7/10}
[List of Patents for class g9b subclass 7.097] 7.097           Subclass 7.097 indent level is 1 Heads, [N: e.g. forming of spot, modulation therefor (modulating lasers H01S3/10; controlling the intensity, colour, phase, polarisation or direction of light beams arriving from an independent light source, e.g. switching gating or modulating G02F1/00; disposition or mounting of head elements within housing or with provision for moving of light source, optical beam or detector, irrelevant to the transducing method G9B/7.041)] {G11B 7/12}
[List of Patents for class g9b subclass 7.098] 7.098           Subclass 7.098 indent level is 2 Optical beam sources therefor (light-emitting diodes H01L33/00; semiconductor lasers H01S5/00); Modulators, e.g. means for controlling the size or intensity of the optical spot or of the optical trace (electro-, magneto-, or acousto-optical modulators G02F1/00; optical diaphragm G03B9/02), [N: e.g. laser control circuitry specially adapted for optical storage devices] {G11B 7/125}
 [N: WARNING
 For all subgroups of G9B/7.098, see also provisional G9B/7.098]
 
[List of Patents for class g9b subclass 7.099] 7.099           Subclass 7.099 indent level is 3 [N: Laser control and stabilisation circuits, methods and arrangements] {G11B 7/125C}
 [List of Patents for class g9b subclass 7.1] 7.1           Subclass 7.1 indent level is 4 [N: Power control during transducing, e.g. by monitoring] [N0408] {G11B 7/125C1}
 [N: WARNING
 [N0408]
 Not complete, see also G9B/7.099]
 
 [List of Patents for class g9b subclass 7.101] 7.101           Subclass 7.101 indent level is 4 [N: Power calibration] [N0408] {G11B 7/125C2}
 [N: WARNING
 N0408]
 Not complete, see also G9B/7.099]
 
 [List of Patents for class g9b subclass 7.102] 7.102           Subclass 7.102 indent level is 3 [N: Collimation, shaping or circularisation of the source beam, e.g. use of slits or filters to modify the source beam] {G11B 7/125D}
[List of Patents for class g9b subclass 7.103] 7.103           Subclass 7.103 indent level is 3 [N: Lasers and multiple laser arrays (lasers per se H01S)] {G11B 7/125L}
 [List of Patents for class g9b subclass 7.104] 7.104           Subclass 7.104 indent level is 4 [N: two or more lasers having different wavelengths] [N0408] {G11B 7/125L2}
 [N: WARNING
 [N0408]
 Not complete, see also G9B/7.103]
 
 [List of Patents for class g9b subclass 7.105] 7.105           Subclass 7.105 indent level is 3 [N: Modulators ( G9B/7.11 takes precedence)] {G11B 7/125M}
 [List of Patents for class g9b subclass 7.106] 7.106           Subclass 7.106 indent level is 2 [N: Protecting the head, e.g. against dust or impact with the record carrier] [N9706] [C0408] {G11B 7/12C}
 [List of Patents for class g9b subclass 7.107] 7.107           Subclass 7.107 indent level is 2 [N: Flying-type heads, e.g. analogous to Winchester type in magnetic recording] {G11B 7/12F}
[List of Patents for class g9b subclass 7.108] 7.108           Subclass 7.108 indent level is 2 [N: Integrated head arrangements, e.g. source and detectors mounted on the same substrate] {G11B 7/12H}
 [List of Patents for class g9b subclass 7.111] 7.111           Subclass 7.111 indent level is 2 Optical detectors therefor (optical detectors per se G01J; demodulating light, transferring the modulation of modulated light, frequency changing of light G02F2/00) [N: Disposition of photodetectors] {G11B 7/13}
 [N: WARNING
 For all subgroups of G9B/7.111, see provisional also G9B/7.111]
 
[List of Patents for class g9b subclass 7.112] 7.112           Subclass 7.112 indent level is 2 Means for guiding the beam from the source to the record carrier or from record carrier to the detector [C0408] {G11B 7/135}
 [N: WARNING
 For all subgroups of G9B/7.112, see provisional also G9B/7.112]
 
 [List of Patents for class g9b subclass 7.113] 7.113           Subclass 7.113 indent level is 3 [N: using diffraction optics, e.g. holograms or gratings (diffraction gratings per se G02B5/18; holograms per se G02B5/32; grating systems G01B27/44)] [C0408] {G11B 7/135A}
 [List of Patents for class g9b subclass 7.114] 7.114           Subclass 7.114 indent level is 3 [N: where the characterising optical element is a double or multiple prism beam splitter, i.e. having at least 2 prisms in cooperation] {G11B 7/135B}
 [List of Patents for class g9b subclass 7.115] 7.115           Subclass 7.115 indent level is 3 [N: where the characterising optical element is a single prism element] {G11B 7/135C}
 [List of Patents for class g9b subclass 7.116] 7.116           Subclass 7.116 indent level is 3 [N: where the characterising optical element is a mirror (galvanomirrors G9B/7.053)] {G11B 7/135D}
[List of Patents for class g9b subclass 7.117] 7.117           Subclass 7.117 indent level is 3 [N: where the characterising optical element is a refractive plate, e.g. wave plate] [C0408] {G11B 7/135E}
 [List of Patents for class g9b subclass 7.118] 7.118           Subclass 7.118 indent level is 4 [N: Stepped phase plates] [N0408] {G11B 7/135E1}
 [N: WARNING
 [N0408]
 Not complete, see also G9B/7.117]
 
 [List of Patents for class g9b subclass 7.119] 7.119           Subclass 7.119 indent level is 4 [N: Active plates, e.g. liquid crystal panel, electrostrictive element] [N0408] {G11B 7/135E2}
 [N: WARNING
 [N0408]
 Not complete, see also G9B/7.117]
 
[List of Patents for class g9b subclass 7.12] 7.12           Subclass 7.12 indent level is 3 [N: where the characterising optical element is a lens] {G11B 7/135F}
 [List of Patents for class g9b subclass 7.121] 7.121           Subclass 7.121 indent level is 4 [N: Objective lenses (optical objectives per se G02B9/00)] [N0408] {G11B 7/135F1}
 [N: WARNING
 [N0408]
 Not complete, see also G9B/7.12]
 
 [List of Patents for class g9b subclass 7.122] 7.122           Subclass 7.122 indent level is 4 [N: Collimator lenses (collimators per se G02B27/30)] [N0408] {G11B 7/135F2}
 [N: WARNING
 [N0408]
 Not complete, see also G9B/7.12]
 
 [List of Patents for class g9b subclass 7.123] 7.123           Subclass 7.123 indent level is 4 [N: Other lenses, e.g. separate aberration correction lens, cylindrical lens to generate astigmatism, beam expanders] [N0408] {G11B 7/135F3}
 [N: WARNING
 [N0408]
 Not complete, see also G9B/7.12]
 
 [List of Patents for class g9b subclass 7.124] 7.124           Subclass 7.124 indent level is 3 [N: Non-lens elements for altering the properties of the beam as it falls on the detector, e.g. knife edges, slits, filters, stops] {G11B 7/135G}
 [List of Patents for class g9b subclass 7.125] 7.125           Subclass 7.125 indent level is 3 [N: using fibre optics] {G11B 7/135L}
 [List of Patents for class g9b subclass 7.126] 7.126           Subclass 7.126 indent level is 3 [N: using the near-field effect (near-field optical probes per se G12B21/06)] [N0408] {G11B 7/135M}
 [N: WARNING
 [N0408]
 Not complete, see also G9B/7.107]
 
 [List of Patents for class g9b subclass 7.127] 7.127           Subclass 7.127 indent level is 3 [N: Numerical aperture control means] [N0408] {G11B 7/135N}
 [N: WARNING
 [N0408]
 Not complete, see also G9B/7.102]
 
[List of Patents for class g9b subclass 7.128] 7.128           Subclass 7.128 indent level is 3 [N: Means for controlling the beam wavefront, e.g. aberration correction (optical systems for aberration correction per se G02B27/00)] [N0408] {G11B 7/135P}
 [N: WARNING
 [N0408]
 Not complete, see also G9B/7.102]
 
 [List of Patents for class g9b subclass 7.129] 7.129           Subclass 7.129 indent level is 4 [N: passive] [N0408] {G11B 7/135P2}
 [N: WARNING
 [N0408]
 Not complete, see also G9B/7.102]
 
[List of Patents for class g9b subclass 7.13] 7.13           Subclass 7.13 indent level is 4 [N: active, e.g. controlled by electrical or mechanical means] [N0408] {G11B 7/135P4}
 [N: WARNING
 [N0408]
 Not complete, see also G9B/7.102]
 
 [List of Patents for class g9b subclass 7.132] 7.132           Subclass 7.132 indent level is 3 [N: where the characterising optical element is a beam splitter or combiner ( G9B/7.113, G9B/7.114 take precedence; beam splitting or combining per se G02B27/10)] [N0408] {G11B 7/135S}
 [N: WARNING
 [N0408]
 Not complete, see also G9B/7.115 to G9B/7.124]
 
 [List of Patents for class g9b subclass 7.133] 7.133           Subclass 7.133 indent level is 3 [N: Means for changing the cross-sectional shape, e.g. circular or elliptical, of the beam] [N0408] {G11B 7/135T}
 [N: WARNING
 [N0408]
 Not complete, see also G9B/7.102]
 
 [List of Patents for class g9b subclass 7.134] 7.134           Subclass 7.134 indent level is 3 [N: characterised by the arrangement of detectors in a multiple array] {G11B 7/13A}
 [List of Patents for class g9b subclass 7.135] 7.135           Subclass 7.135 indent level is 3 [N: characterised by the shape of individual detector elements] {G11B 7/13B}
 [List of Patents for class g9b subclass 7.136] 7.136           Subclass 7.136 indent level is 2 adapted to record on, or to reproduce from, more than one track simultaneously ( G9B/7.137 takes precedence) {G11B 7/14}
 [List of Patents for class g9b subclass 7.137] 7.137           Subclass 7.137 indent level is 2 Dual-recording arrangements, i.e. in which the information is recorded in two different forms simultaneously on the same or related tracks, e.g. recording instantaneous and mean values (sound recording combined with cinematography G03C) {G11B 7/20}
 [List of Patents for class g9b subclass 7.138] 7.138           Subclass 7.138 indent level is 2 Apparatus or processes specially adapted for the manufacture of heads, e.g. assembly {G11B 7/22}
[List of Patents for class g9b subclass 7.139] 7.139           Subclass 7.139 indent level is 1 Record carriers characterised by the selection of the material or by the structure or form (characterised by the arrangement of information on the carrier G9B/7.029[N: G9B/7.039]; photosensitive materials per se G03C) {G11B 7/24}
[List of Patents for class g9b subclass 7.14] 7.14           Subclass 7.14 indent level is 2 characterised by the selection of the material [N0505] {G11B 7/241}
[List of Patents for class g9b subclass 7.141] 7.141           Subclass 7.141 indent level is 3 of recording layers [N0505] {G11B 7/242}
[List of Patents for class g9b subclass 7.142] 7.142           Subclass 7.142 indent level is 4 comprising inorganic material only, e.g. ablative layers [N0505] {G11B 7/243}
 [List of Patents for class g9b subclass 7.143] 7.143           Subclass 7.143 indent level is 5 [N: Metals or metalloids] [N0804] {G11B 7/243B}
 [List of Patents for class g9b subclass 7.144] 7.144           Subclass 7.144 indent level is 5 [N: Non-metallic elements] [N0804] {G11B 7/243D}
[List of Patents for class g9b subclass 7.145] 7.145           Subclass 7.145 indent level is 4 comprising organic material only [N0505] {G11B 7/244}
 [List of Patents for class g9b subclass 7.146] 7.146           Subclass 7.146 indent level is 5 containing an azulene compound [N0505] {G11B 7/244B}
 [List of Patents for class g9b subclass 7.147] 7.147           Subclass 7.147 indent level is 5 containing a polymeric component [N0505] {G11B 7/245}
[List of Patents for class g9b subclass 7.148] 7.148           Subclass 7.148 indent level is 5 containing dyes [N0505] {G11B 7/246}
 [List of Patents for class g9b subclass 7.149] 7.149           Subclass 7.149 indent level is 6 [N: Azo-dyes] [N0804] {G11B 7/246A}
[List of Patents for class g9b subclass 7.15] 7.15           Subclass 7.15 indent level is 6 Methine or polymethine dyes [N0505] {G11B 7/247}
 [List of Patents for class g9b subclass 7.151] 7.151           Subclass 7.151 indent level is 7 [N: Cyanine] [N0804] {G11B 7/247B}
 [List of Patents for class g9b subclass 7.152] 7.152           Subclass 7.152 indent level is 7 [N: Merocyanine] [N0804] {G11B 7/247D}
 [List of Patents for class g9b subclass 7.153] 7.153           Subclass 7.153 indent level is 7 [N: Oxonol] [N0804] {G11B 7/247F}
 [List of Patents for class g9b subclass 7.154] 7.154           Subclass 7.154 indent level is 6 Porphines; Azaporphines, e.g. phthalocyanines [N0505] {G11B 7/248}
[List of Patents for class g9b subclass 7.155] 7.155           Subclass 7.155 indent level is 5 containing organo-metallic compounds ( G9B/7.148 takes precedence) [N0505] {G11B 7/249}
 [List of Patents for class g9b subclass 7.156] 7.156           Subclass 7.156 indent level is 6 [N: neutral] [N0804] {G11B 7/249B}
 [List of Patents for class g9b subclass 7.157] 7.157           Subclass 7.157 indent level is 6 [N: as anion] [N0804] {G11B 7/249D}
 [List of Patents for class g9b subclass 7.158] 7.158           Subclass 7.158 indent level is 6 [N: as cation] [N0804] {G11B 7/249F}
 [List of Patents for class g9b subclass 7.159] 7.159           Subclass 7.159 indent level is 2 [N: Conditioning of record carrier e.g. mechanised protection or means for reducing influence of physical parameters e.g. temperature large, moisture (for record carriers not specific to the method of recording or reproducing G9B/23; by using layers integrated with the recording layer G9B/7.181)] {G11B 7/24C}
[List of Patents for class g9b subclass 7.16] 7.16           Subclass 7.16 indent level is 2 [N: characterised by the form of the carrier] [N0408] {G11B 7/24F}
 [N: WARNING
 [N0408]
  G9B/7.16 and sub-groups are not complete, see also G9B/7.139]
 
[List of Patents for class g9b subclass 7.161] 7.161           Subclass 7.161 indent level is 3 [N: Cards] [N0408] {G11B 7/24F2}
 [List of Patents for class g9b subclass 7.162] 7.162           Subclass 7.162 indent level is 4 [N: intended for rotation] [N0408] {G11B 7/24F2R}
 [List of Patents for class g9b subclass 7.163] 7.163           Subclass 7.163 indent level is 3 [N: Tapes] [N0408] {G11B 7/24F4}
 [List of Patents for class g9b subclass 7.164] 7.164           Subclass 7.164 indent level is 3 [N: Cylinders] [N0408] {G11B 7/24F8}
 [List of Patents for class g9b subclass 7.165] 7.165           Subclass 7.165 indent level is 2 [N: Structures specially adapted for reproducing ( G9B/7.159 takes precedence)] {G11B 7/24R}
[List of Patents for class g9b subclass 7.166] 7.166           Subclass 7.166 indent level is 2 [N: characterised by the structure, e.g. involving layers] [N0408] {G11B 7/24S}
 [N: WARNING
 [N0408]
  G9B/7.166 and sub-groups are not complete, see also G9B/7.139]
 
[List of Patents for class g9b subclass 7.171] 7.171           Subclass 7.171 indent level is 3 of layers other than recording layers [N0505] {G11B 7/252}
 [N: Note
 In group G9B/7.171, multi-aspect classification is applied, so that if subject matter is characterised by aspects covered by more than one of its subgroups, the subject matter should be classified in each of those subgroups.]
 
[List of Patents for class g9b subclass 7.172] 7.172           Subclass 7.172 indent level is 4 Base layers [N0505] {G11B 7/253}
 [List of Patents for class g9b subclass 7.173] 7.173           Subclass 7.173 indent level is 5 [N: comprising glass] [N0804] {G11B 7/253B}
 [List of Patents for class g9b subclass 7.174] 7.174           Subclass 7.174 indent level is 5 [N: comprising metals] [N0804] {G11B 7/253D}
[List of Patents for class g9b subclass 7.175] 7.175           Subclass 7.175 indent level is 5 [N: comprising resins] [N0804] {G11B 7/253F}
 [List of Patents for class g9b subclass 7.176] 7.176           Subclass 7.176 indent level is 6 [N: Polycarbonate (PC)] [N0804] {G11B 7/253F2}
 [List of Patents for class g9b subclass 7.177] 7.177           Subclass 7.177 indent level is 6 [N: Polyester, e.g. PET, PETG, PEN] [N0804] {G11B 7/253F3}
 [List of Patents for class g9b subclass 7.178] 7.178           Subclass 7.178 indent level is 6 [N: Polystyrene (PS)] [N0804] {G11B 7/253F4}
 [List of Patents for class g9b subclass 7.179] 7.179           Subclass 7.179 indent level is 6 [N: Polycycloolefines (COCs)] [N0804] {G11B 7/253F5}
 [List of Patents for class g9b subclass 7.18] 7.18           Subclass 7.18 indent level is 6 [N: Biodegradable polymers, cellulose included] [N0804] {G11B 7/253F6}
[List of Patents for class g9b subclass 7.181] 7.181           Subclass 7.181 indent level is 4 Protective topcoat layers [N0505] {G11B 7/254}
 [List of Patents for class g9b subclass 7.185] 7.185           Subclass 7.185 indent level is 4 Layers improving adhesion between layers [N0505] {G11B 7/256}
[List of Patents for class g9b subclass 7.186] 7.186           Subclass 7.186 indent level is 4 Layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers [N: or dielectric layers, protecting the recording layers] [N0505] {G11B 7/257}
[List of Patents for class g9b subclass 7.187] 7.187           Subclass 7.187 indent level is 5 [N: consisting essentially of organic materials] [N0804] {G11B 7/257B}
 [List of Patents for class g9b subclass 7.188] 7.188           Subclass 7.188 indent level is 6 [N: Resins] [N0804] {G11B 7/257B2}
 [List of Patents for class g9b subclass 7.189] 7.189           Subclass 7.189 indent level is 5 [N: consisting essentially of inorganic materials] [N0804] {G11B 7/257D}
[List of Patents for class g9b subclass 7.19] 7.19           Subclass 7.19 indent level is 4 Reflective layers [N0505] {G11B 7/258}
 [List of Patents for class g9b subclass 7.191] 7.191           Subclass 7.191 indent level is 5 [N: based on aluminium] [N0804] {G11B 7/258B}
 [List of Patents for class g9b subclass 7.192] 7.192           Subclass 7.192 indent level is 5 [N: based on silver] [N0804] {G11B 7/258D}
 [List of Patents for class g9b subclass 7.193] 7.193           Subclass 7.193 indent level is 5 [N: based on gold] [N0804] {G11B 7/258F}
[List of Patents for class g9b subclass 7.194] 7.194           Subclass 7.194 indent level is 2 Apparatus or processes specially adapted for the manufacture of record carriers (processes involving a single technical art and for which provision exists elsewhere, see the relevant class, e.g. B29, G03) [N: manufacture of intermediate mediums, e.g. matrixes for processing G9B/23.008] {G11B 7/26}
 [List of Patents for class g9b subclass 7.2] 7.2           Subclass 7.2 indent level is 1 Re-recording, i.e. transcribing information from one optical record carrier on to one or more similar or dissimilar record carriers {G11B 7/28}
[List of Patents for class g9b subclass 9] 9           Recording or reproducing using a method not covered by one of the main groups G9B/3 to G9B/7; Record carriers therefor ( G9B/11 takes precedence) [N: driving or moving of heads G9B/21.003]{G11B 9/00}
 [N: Note
 [C0201]
 In this group, the expression "+IDT" is used to indicate:
 - that the documents classified here were classified in IDT-groups concerning:
 "Recording or reproducing methods or devices not covered by one of the main groups G9B/3 to G9B/7, e.g. using variable resistance or capacitance carriers"
 - that they were reclassified administratively from said IDT-groups to this group]
 
[List of Patents for class g9b subclass 9.001] 9.001           Subclass 9.001 indent level is 1 [N: Recording by means directly associated with the tip of a microscopic electrical probe as used in Scanning Tunneling (STM) or Atomic Force Microscopy (AFM) for inducing physical or electrical perturbations in a recording medium, the permanent effect of which being the writing of at least one information unit of a sequence disposed along a track; Reproducing such memorised information by such association of tip and means; Record carriers or media specially adapted for such transducing of information (marking using electrical current B41M5/20; investigating materials by using tunnel effect G01N27/00F; measuring irregularity of surfaces by using scanning force microscopes G01B7/34A)] {G11B 9/00A}
 [N: Note
 Classification in these groups is done according to the means required for the conditioning, disposition, mounting and positioning of the heads and record carriers, with regard to the microscopic size of the transducing zones]
 
 [List of Patents for class g9b subclass 9.002] 9.002           Subclass 9.002 indent level is 2 [N: Heads] {G11B 9/00A2}
[List of Patents for class g9b subclass 9.003] 9.003           Subclass 9.003 indent level is 2 [N: Disposition or mounting of heads or record carriers ( G9B/17 and G9B/19 take precedence)] {G11B 9/00A3}
[List of Patents for class g9b subclass 9.008] 9.008           Subclass 9.008 indent level is 2 [N: Record carriers] {G11B 9/00A4}
 [List of Patents for class g9b subclass 9.012] 9.012           Subclass 9.012 indent level is 1 using ferroelectric record carriers; Record carriers therefor {G11B 9/02}
 [List of Patents for class g9b subclass 9.013] 9.013           Subclass 9.013 indent level is 1 using record carriers having variable electric resistance; Record carriers therefor {G11B 9/04}
[List of Patents for class g9b subclass 9.014] 9.014           Subclass 9.014 indent level is 1 using record carriers having variable electrical capacitance; Record carriers therefor ( G9B/9.012 takes precedence) {G11B 9/06}
[List of Patents for class g9b subclass 9.015] 9.015           Subclass 9.015 indent level is 2 [N: Record carriers characterised by their structure or form or by the selection of the material; Apparatus or processes specially adapted for the manufacture of record carriers (processes involving a single technical art and for which provision exists elsewhere, see the relevant class, e.g. B05D, F16N, C08L)] {G11B 9/06R}
[List of Patents for class g9b subclass 9.022] 9.022           Subclass 9.022 indent level is 2 Heads for reproducing capacitive information {G11B 9/07}
 [List of Patents for class g9b subclass 9.024] 9.024           Subclass 9.024 indent level is 1 using electrostatic charge injection; Record carriers therefor {G11B 9/08}
 [List of Patents for class g9b subclass 9.025] 9.025           Subclass 9.025 indent level is 1 using electron beam; Record carriers therefor ( G9B/9.024 takes precedence) [N: see provisional also G9B/11.004] {G11B 9/10}
[List of Patents for class g9b subclass 11] 11           Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G9B/3 to G9B/7 or by different subgroups of group G9B/9; Record carriers therefor [N: driving or moving of heads G9B/3.008, G9B/5.147, G9B/7.041, G9B/21.003]{G11B 11/00}
 [N: Notes
 [C0201]
 In this group, the expression "+IDT" is used to indicate:
 - that the documents classified here were classified in IDT-groups concerning:
 "Methods or devices wherein the recording and the reproducing operations are carried out according to different methods"
 - that they were reclassified administratively from said IDT-groups to this group
 Groups G9B/11 to G9B/11.058mainly cover:
 - combined systems or apparatus comprising both recording and reproducing using different methods;
 - record carriers therefor.
 Reading only or recording only using mechanical, magnetic, optical or other methods is covered by groups G9B/3 to G9B/9.024]]
 
[List of Patents for class g9b subclass 11.001] 11.001           Subclass 11.001 indent level is 1 [N: using recording by perturbation of the physical or electrical structure] {G11B 11/00A}
 [List of Patents for class g9b subclass 11.002] 11.002           Subclass 11.002 indent level is 2 [N: with reproducing by using non-optical beam of radiation or particles, e.g. electrons, directly interacting with the memorised information ( G9B/11.003 takes precedence)] {G11B 11/00A2}
 [List of Patents for class g9b subclass 11.003] 11.003           Subclass 11.003 indent level is 2 [N: with reproducing by means directly associated with the tip of a microscopic electrical probe as defined in G9B/9.001(details of heads or their disposition or mounting G9B/9.002 and G9B/9.003)] {G11B 11/00A4}
[List of Patents for class g9b subclass 11.004] 11.004           Subclass 11.004 indent level is 1 using recording by deforming with non-mechanical means, e.g. laser, beam of particles [N: ( G9B/11.001 takes precedence; see proviosional also G9B/3.099 to G9B/3.107)] {G11B 11/03}
 [List of Patents for class g9b subclass 11.005] 11.005           Subclass 11.005 indent level is 2 with reproducing by capacitive means [N: G9B/9.022 takes precedence] {G11B 11/05}
 [List of Patents for class g9b subclass 11.006] 11.006           Subclass 11.006 indent level is 2 with reproducing by mechanical sensing {G11B 11/06}
 [List of Patents for class g9b subclass 11.007] 11.007           Subclass 11.007 indent level is 1 using recording by electric charge or by variation of electric resistance or capacitance [N: ( G9B/11.001, G9B/11.008 take precedence)] {G11B 11/08}
[List of Patents for class g9b subclass 11.008] 11.008           Subclass 11.008 indent level is 1 using recording by magnetic means [N: or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field] {G11B 11/10}
[List of Patents for class g9b subclass 11.009] 11.009           Subclass 11.009 indent level is 2 using a beam of light or a magnetic field for recording [N: by change of magnetisation] and a beam of light for reproducing, e.g. light-induced thermo-magnetic recording, Kerr effect reproducing [N: spin magnetisation recording] [N0002] {G11B 11/105}
[List of Patents for class g9b subclass 11.01] 11.01           Subclass 11.01 indent level is 3 [N: characterised by the transducing operation to be executed] [N0002] {G11B 11/105B}
[List of Patents for class g9b subclass 11.011] 11.011           Subclass 11.011 indent level is 4 [N: Recording (for shaping of magnetic domains G9B/11.022, for compensation of shift G9B/11.023)] [N0002] {G11B 11/105B1}
 [List of Patents for class g9b subclass 11.016] 11.016           Subclass 11.016 indent level is 4 [N: Reproducing (compensating pit shift G9B/11.023)] [N0002] {G11B 11/105B2}
[List of Patents for class g9b subclass 11.017] 11.017           Subclass 11.017 indent level is 4 [N: Overwriting or erasing ( G9B/11.021 takes precedence)] [N0002] {G11B 11/105B3}
 [List of Patents for class g9b subclass 11.02] 11.02           Subclass 11.02 indent level is 4 [N: Initialising] [N0002] {G11B 11/105B4}
 [List of Patents for class g9b subclass 11.021] 11.021           Subclass 11.021 indent level is 4 [N: Bulk initialisation or erasing, e.g. at least one whole information track with a single action] [N0002] {G11B 11/105B5}
 [List of Patents for class g9b subclass 11.022] 11.022           Subclass 11.022 indent level is 4 [N: Shaping of magnetic domains, e.g. form, dimensions] [N0002] {G11B 11/105B6}
 [List of Patents for class g9b subclass 11.023] 11.023           Subclass 11.023 indent level is 4 [N: to compensate for the magnetic domain drift of time shift] [N0002] {G11B 11/105B7}
[List of Patents for class g9b subclass 11.024] 11.024           Subclass 11.024 indent level is 3 [N: Heads] [N0002] {G11B 11/105D}
[List of Patents for class g9b subclass 11.032] 11.032           Subclass 11.032 indent level is 3 [N: Disposition or mounting of transducers relative to record carriers] [N0002] {G11B 11/105G}
[List of Patents for class g9b subclass 11.033] 11.033           Subclass 11.033 indent level is 4 [N: Arrangements of transducers relative to each other, e.g. coupled heads, optical and magnetic head on the same base (for relative movement of transducers G9B/11.043)] [N0002] {G11B 11/105G1}
[List of Patents for class g9b subclass 11.035] 11.035           Subclass 11.035 indent level is 4 [N: with provision for moving or switching or masking the transducers in or out of their operative position] [N0002] {G11B 11/105G2}
[List of Patents for class g9b subclass 11.044] 11.044           Subclass 11.044 indent level is 4 [N: with provision for moving the transducers for maintaining alignment or spacing relative to the carrier] [N0002] {G11B 11/105G3}
 [List of Patents for class g9b subclass 11.046] 11.046           Subclass 11.046 indent level is 4 [N: Flying heads] [N0002] {G11B 11/105G4}
[List of Patents for class g9b subclass 11.047] 11.047           Subclass 11.047 indent level is 3 [N: Record carriers characterised by the selection of the material or by the structure or form] [N0002] {G11B 11/105M}
[List of Patents for class g9b subclass 11.053] 11.053           Subclass 11.053 indent level is 3 [N: Control of operating function] [N0002] {G11B 11/105P}
 [List of Patents for class g9b subclass 11.055] 11.055           Subclass 11.055 indent level is 2 using a beam, [N: e.g. of electrons or X-rays] other than a beam of light [N: or a magnetic field] for recording [N0002] {G11B 11/11}
 [List of Patents for class g9b subclass 11.056] 11.056           Subclass 11.056 indent level is 2 [N: using a beam, [N: e.g. of electrons or X-rays] other than a beam of light for reproducing [N0002] {G11B 11/115}
[List of Patents for class g9b subclass 11.057] 11.057           Subclass 11.057 indent level is 1 using recording by optical means ( G9B/11.004 takes precedence) [N: G9B/11.008 takes precedence] {G11B 11/12}
 [List of Patents for class g9b subclass 11.058] 11.058           Subclass 11.058 indent level is 2 with reproducing by magnetic means {G11B 11/14}
[List of Patents for class g9b subclass 11.059] 11.059           Subclass 11.059 indent level is 1 using recording by mechanical cutting, deforming or pressing [N: ( G9B/11.001 takes precedence)] {G11B 11/16}
 [List of Patents for class g9b subclass 11.06] 11.06           Subclass 11.06 indent level is 2 with reproducing by optical means {G11B 11/18}
 [List of Patents for class g9b subclass 11.061] 11.061           Subclass 11.061 indent level is 2 with reproducing by magnetic means {G11B 11/20}
 [List of Patents for class g9b subclass 11.062] 11.062           Subclass 11.062 indent level is 2 with reproducing by capacitive means [N: see provisionally G9B/9.014, G9B/9.022; G9B/11.005] {G11B 11/22}
[List of Patents for class g9b subclass 13] 13           Recording simultaneously [N: or selectively] by methods covered by different main groups [N: among G9B/3, G9B/5, G9B/7 and G9B/9]; Record carriers therefor [N: not otherwise provided for]; Reproducing therefrom [N: not otherwise provided for ( G9B/9.001 and G9B/11.001 take precedence; driving or moving of heads G9B/3.008, G9B/5.147, G9B/7.041 and G9B/21.003)]{G11B 13/00}
 [N: Note
 This group is limited to the combination of recording and reproducing on the same record carrier by more than one of the different method covered by groups G9B/3, G9B/5, G9B/7 and G9B/9]
 
 [List of Patents for class g9b subclass 13.001] 13.001           Subclass 13.001 indent level is 1 magnetically and by styli {G11B 13/02}
[List of Patents for class g9b subclass 13.002] 13.002           Subclass 13.002 indent level is 1 magnetically [N: or by magnetisation] and optically [N: or by radiation, for changing or sensing optical properties] {G11B 13/04}
 [List of Patents for class g9b subclass 13.003] 13.003           Subclass 13.003 indent level is 2 [N: combined recording by magnetic and optic means] {G11B 13/04C}
 [List of Patents for class g9b subclass 13.004] 13.004           Subclass 13.004 indent level is 1 optically and by styli {G11B 13/06}
[List of Patents for class g9b subclass 15] 15           Driving, starting or stopping record carriers of filamentary or web form; Driving both such record carriers and heads; Guiding such record carriers or containers therefor; Control thereof; Control of operating function (driving or guiding heads G9B/3 to G9B/7, G9B/21){G11B 15/00}
 [List of Patents for class g9b subclass 15.001] 15.001           Subclass 15.001 indent level is 1 [N: Programmed access in sequence to indexed parts of tracks of operating tapes, by driving or guiding the tape (access by driving of both record carrier and head G9B/15.023; see prov. also G9B/15.077)] {G11B 15/00A}
[List of Patents for class g9b subclass 15.002] 15.002           Subclass 15.002 indent level is 1 Control of operating function, e.g. switching from recording to reproducing {G11B 15/02}
 [List of Patents for class g9b subclass 15.003] 15.003           Subclass 15.003 indent level is 2 [N: remotely controlled] {G11B 15/02C}
 [List of Patents for class g9b subclass 15.004] 15.004           Subclass 15.004 indent level is 2 [N: by using processor, e.g. microcomputer; see provisional also G9B/15.001] {G11B 15/02P}
 [List of Patents for class g9b subclass 15.005] 15.005           Subclass 15.005 indent level is 2 by using counters [N: see prov. also G9B/15, G9B/27] {G11B 15/03}
 [List of Patents for class g9b subclass 15.006] 15.006           Subclass 15.006 indent level is 2 Preventing, inhibiting, or warning against accidental erasing or double recording ( G9B/15.007 takes precedence) {G11B 15/04}
[List of Patents for class g9b subclass 15.007] 15.007           Subclass 15.007 indent level is 2 by sensing features present on or derived from record carrier or container ( G9B/15.019 takes precedence) [N: see provisional also G9B/15.002] {G11B 15/05}
[List of Patents for class g9b subclass 15.013] 15.013           Subclass 15.013 indent level is 2 Manually-operated control; Solenoid-operated control [N: G9B/15.049 takes precedence] {G11B 15/10}
 [List of Patents for class g9b subclass 15.014] 15.014           Subclass 15.014 indent level is 3 [N: electrically operated] {G11B 15/10E}
 [List of Patents for class g9b subclass 15.015] 15.015           Subclass 15.015 indent level is 3 [N: mechanically operated] {G11B 15/10M}
[List of Patents for class g9b subclass 15.016] 15.016           Subclass 15.016 indent level is 2 Masking of heads; [N: circuits for] Selecting or switching of heads between operative and inoperative functions [N: or between different operative functions or for selection between operative heads]; Masking of beams, e.g. of light beams [N: track selection by moving the magnetic head G9B/5.181] {G11B 15/12}
[List of Patents for class g9b subclass 15.019] 15.019           Subclass 15.019 indent level is 2 by sensing presence, absence or position of record carrier or container {G11B 15/16}
 [List of Patents for class g9b subclass 15.02] 15.02           Subclass 15.02 indent level is 3 of container [N: see prov. also G9B/15.019] {G11B 15/17}
[List of Patents for class g9b subclass 15.021] 15.021           Subclass 15.021 indent level is 1 Driving; Starting; Stopping; Arrangements for control or regulation thereof [N: G9B/15.074 takes precedence; handling tapes or filamentary material in general B65H23/00] {G11B 15/18}
[List of Patents for class g9b subclass 15.022] 15.022           Subclass 15.022 indent level is 2 [N: Driving of both record carrier and head ( G9B/15.055 takes precedence; mounting of head G9B/5.173)] {G11B 15/18B}
[List of Patents for class g9b subclass 15.031] 15.031           Subclass 15.031 indent level is 2 [N: for record carriers inside containers] {G11B 15/18C}
 [List of Patents for class g9b subclass 15.032] 15.032           Subclass 15.032 indent level is 3 [N: the record carrier being endless] {G11B 15/18C1}
 [List of Patents for class g9b subclass 15.033] 15.033           Subclass 15.033 indent level is 2 Moving record carrier backwards or forwards by finite amounts, i.e. backspacing, forward spacing {G11B 15/20}
 [List of Patents for class g9b subclass 15.034] 15.034           Subclass 15.034 indent level is 2 Stopping means (slowing-down preparatory to stopping or speed-changing G9B/15.07; speed-controlling by mechanical linkage G9B/15.071; brake constructions in general F16D) [N: G9B/15.008 takes precedence; inside container G9B/23.049] {G11B 15/22}
 [List of Patents for class g9b subclass 15.035] 15.035           Subclass 15.035 indent level is 2 Drive disengaging means {G11B 15/24}
[List of Patents for class g9b subclass 15.036] 15.036           Subclass 15.036 indent level is 2 Driving record carriers by members acting directly or indirectly thereon [N: G9B/15.049 takes precedence; Driving features inside container, see G9B/23.049 and subgroups] {G11B 15/26}
[List of Patents for class g9b subclass 15.044] 15.044           Subclass 15.044 indent level is 2 Driving record carriers by pneumatic means [N: pneumatic control for capstans driving the record carrier by frictional contact G9B/15.038] {G11B 15/38}
[List of Patents for class g9b subclass 15.046] 15.046           Subclass 15.046 indent level is 2 Driving record carriers otherwise than by electric motor {G11B 15/40}
 [List of Patents for class g9b subclass 15.047] 15.047           Subclass 15.047 indent level is 3 manually {G11B 15/42}
 [List of Patents for class g9b subclass 15.048] 15.048           Subclass 15.048 indent level is 2 Control or regulation of mechanical tension of record carrier, e.g. tape tension (controlling tension in filamentary material in general B65H59/00) [N: by speed regulation G9B/15.054; by using reserve loops G9B/15.074] {G11B 15/43}
[List of Patents for class g9b subclass 15.049] 15.049           Subclass 15.049 indent level is 2 Speed-changing arrangements; Reversing arrangements; Drive transfer means therefor {G11B 15/44}
 [List of Patents for class g9b subclass 15.05] 15.05           Subclass 15.05 indent level is 3 [N: Control thereof] {G11B 15/44C}
[List of Patents for class g9b subclass 15.051] 15.051           Subclass 15.051 indent level is 3 [N: reversing arrangements ( G9B/15.05 takes precedence)] {G11B 15/44R}
[List of Patents for class g9b subclass 15.052] 15.052           Subclass 15.052 indent level is 4 [N: by driving the reels only] {G11B 15/44R1}
 [List of Patents for class g9b subclass 15.053] 15.053           Subclass 15.053 indent level is 5 [N: automatic reverse drive transfer therefor] {G11B 15/44R1A}
[List of Patents for class g9b subclass 15.054] 15.054           Subclass 15.054 indent level is 2 Controlling, regulating, or indicating speed [N: dependent on position of tape in reserve, loop G9B/15.074, G9B/15.075] {G11B 15/46}
[List of Patents for class g9b subclass 15.055] 15.055           Subclass 15.055 indent level is 3 in arrangements for recording or reproducing wherein both record carriers and heads are driven [N: see provisional also G9B/15.022] {G11B 15/467}
[List of Patents for class g9b subclass 15.063] 15.063           Subclass 15.063 indent level is 3 [N: by using pilot tracking tones embedded in binary coded signals, e.g. using DSV/CDS values of coded signals] {G11B 15/46E}
 [List of Patents for class g9b subclass 15.07] 15.07           Subclass 15.07 indent level is 3 Starting; Accelerating; Decelerating; Arrangements preventing malfunction during drive change {G11B 15/48}
 [List of Patents for class g9b subclass 15.071] 15.071           Subclass 15.071 indent level is 3 by mechanical linkage, e.g. clutch {G11B 15/50}
 [List of Patents for class g9b subclass 15.072] 15.072           Subclass 15.072 indent level is 3 by using signals recorded on, or derived from, record carrier {G11B 15/52}
 [List of Patents for class g9b subclass 15.073] 15.073           Subclass 15.073 indent level is 3 by stroboscope; by tachometer (speedometers or tachometers G01P) {G11B 15/54}
[List of Patents for class g9b subclass 15.074] 15.074           Subclass 15.074 indent level is 1 the record carrier having reserve loop, e.g. to minimise inertia during acceleration [N: measuring or control in connection therewith] {G11B 15/56}
 [List of Patents for class g9b subclass 15.075] 15.075           Subclass 15.075 indent level is 2 with vacuum column {G11B 15/58}
[List of Patents for class g9b subclass 15.076] 15.076           Subclass 15.076 indent level is 1 Guiding record carrier (guiding devices structurally associated with magazines or cassettes G9B/23.049) {G11B 15/60}
 [List of Patents for class g9b subclass 15.077] 15.077           Subclass 15.077 indent level is 2 [N: for track selection, acquisition or following] {G11B 15/60F}
[List of Patents for class g9b subclass 15.078] 15.078           Subclass 15.078 indent level is 2 [N: without displacing the guiding means] {G11B 15/60G}
 [List of Patents for class g9b subclass 15.079] 15.079           Subclass 15.079 indent level is 3 [N: Pneumatic guiding] {G11B 15/60G1}
[List of Patents for class g9b subclass 15.08] 15.08           Subclass 15.08 indent level is 2 on drum, e.g. drum containing rotating heads [N: G9B/15.084 takes precedence] {G11B 15/61}
 [List of Patents for class g9b subclass 15.081] 15.081           Subclass 15.081 indent level is 3 [N: inside container] {G11B 15/61C}
[List of Patents for class g9b subclass 15.082] 15.082           Subclass 15.082 indent level is 2 Maintaining desired spacing between record carrier and head {G11B 15/62}
 [List of Patents for class g9b subclass 15.083] 15.083           Subclass 15.083 indent level is 3 by fluid-dynamic spacing {G11B 15/64}
[List of Patents for class g9b subclass 15.084] 15.084           Subclass 15.084 indent level is 2 Threading; Loading; Automatic self-loading {G11B 15/66}
[List of Patents for class g9b subclass 15.093] 15.093           Subclass 15.093 indent level is 1 Guiding containers [N: e.g. loading, ejecting cassettes] {G11B 15/675}
[List of Patents for class g9b subclass 15.094] 15.094           Subclass 15.094 indent level is 2 [N: Details] {G11B 15/675A}
 [List of Patents for class g9b subclass 15.095] 15.095           Subclass 15.095 indent level is 3 [N: Servo control] {G11B 15/675A1}
 [List of Patents for class g9b subclass 15.096] 15.096           Subclass 15.096 indent level is 3 [N: Ejection damping means] {G11B 15/675A2}
[List of Patents for class g9b subclass 15.097] 15.097           Subclass 15.097 indent level is 2 [N: with movement of the cassette parallel to its main side, i.e. front loading ( G9B/15.11 takes precedence)] {G11B 15/675B}
[List of Patents for class g9b subclass 15.098] 15.098           Subclass 15.098 indent level is 3 [N: and movement of driving elements perpendicular thereto] {G11B 15/675B1}
 [List of Patents for class g9b subclass 15.099] 15.099           Subclass 15.099 indent level is 4 [N: with servo control] {G11B 15/675B1A}
 [List of Patents for class g9b subclass 15.1] 15.1           Subclass 15.1 indent level is 4 [N: with ejection damping means] {G11B 15/675B1B}
[List of Patents for class g9b subclass 15.101] 15.101           Subclass 15.101 indent level is 3 [N: of cassette with internal belt drive] {G11B 15/675B2}
 [List of Patents for class g9b subclass 15.102] 15.102           Subclass 15.102 indent level is 4 [N: with servo control] {G11B 15/675B2A}
 [List of Patents for class g9b subclass 15.103] 15.103           Subclass 15.103 indent level is 4 [N: with ejection damping means] {G11B 15/675B2B}
[List of Patents for class g9b subclass 15.104] 15.104           Subclass 15.104 indent level is 3 [N: of endless tape cassette] {G11B 15/675B3}
 [List of Patents for class g9b subclass 15.105] 15.105           Subclass 15.105 indent level is 4 [N: with servo control] {G11B 15/675B3A}
 [List of Patents for class g9b subclass 15.106] 15.106           Subclass 15.106 indent level is 4 [N: with ejection damping means] {G11B 15/675B3B}
[List of Patents for class g9b subclass 15.107] 15.107           Subclass 15.107 indent level is 3 [N: of cassette inside drawer] {G11B 15/675B4}
 [List of Patents for class g9b subclass 15.108] 15.108           Subclass 15.108 indent level is 4 [N: with servo control] {G11B 15/675B4A}
 [List of Patents for class g9b subclass 15.109] 15.109           Subclass 15.109 indent level is 4 [N: with ejection damping means] {G11B 15/675B4B}
[List of Patents for class g9b subclass 15.11] 15.11           Subclass 15.11 indent level is 2 [N: with movement of the cassette parallel to its main side and subsequent movement perpendicular thereto, i.e. front loading] {G11B 15/675C}
[List of Patents for class g9b subclass 15.111] 15.111           Subclass 15.111 indent level is 3 [N: the two movements being made by the cassette holder] {G11B 15/675C1}
 [List of Patents for class g9b subclass 15.112] 15.112           Subclass 15.112 indent level is 4 [N: with servo control] {G11B 15/675C1A}
 [List of Patents for class g9b subclass 15.113] 15.113           Subclass 15.113 indent level is 4 [N: with ejection damping means] {G11B 15/675C1B}
[List of Patents for class g9b subclass 15.114] 15.114           Subclass 15.114 indent level is 3 [N: the second movement only being made by the cassette holder] {G11B 15/675C2}
 [List of Patents for class g9b subclass 15.115] 15.115           Subclass 15.115 indent level is 4 [N: with servo control] {G11B 15/675C2A}
 [List of Patents for class g9b subclass 15.116] 15.116           Subclass 15.116 indent level is 4 [N: with ejection damping means] {G11B 15/675C2B}
[List of Patents for class g9b subclass 15.117] 15.117           Subclass 15.117 indent level is 2 [N: with movement of the cassette perpendicular to its main side, i.e. top loading] {G11B 15/675D}
[List of Patents for class g9b subclass 15.118] 15.118           Subclass 15.118 indent level is 3 [N: of the cassette with holder] {G11B 15/675D1}
 [List of Patents for class g9b subclass 15.119] 15.119           Subclass 15.119 indent level is 4 [N: with servo control] {G11B 15/675D1A}
 [List of Patents for class g9b subclass 15.12] 15.12           Subclass 15.12 indent level is 4 [N: with ejection damping means] {G11B 15/675D1B}
[List of Patents for class g9b subclass 15.121] 15.121           Subclass 15.121 indent level is 3 [N: of the cassette without holder] {G11B 15/675D2}
 [List of Patents for class g9b subclass 15.122] 15.122           Subclass 15.122 indent level is 4 [N: with servo control] {G11B 15/675D2A}
 [List of Patents for class g9b subclass 15.123] 15.123           Subclass 15.123 indent level is 4 [N: with ejection damping means] {G11B 15/675D2B}
[List of Patents for class g9b subclass 15.124] 15.124           Subclass 15.124 indent level is 2 [N: with pivoting movement of the cassette holder] {G11B 15/675E}
[List of Patents for class g9b subclass 15.125] 15.125           Subclass 15.125 indent level is 3 [N: outside the apparatus] {G11B 15/675E1}
 [List of Patents for class g9b subclass 15.126] 15.126           Subclass 15.126 indent level is 4 [N: with servo control] {G11B 15/675E1A}
 [List of Patents for class g9b subclass 15.127] 15.127           Subclass 15.127 indent level is 4 [N: with ejection damping means] {G11B 15/675E1B}
[List of Patents for class g9b subclass 15.128] 15.128           Subclass 15.128 indent level is 3 [N: inside the apparatus] {G11B 15/675E2}
 [List of Patents for class g9b subclass 15.129] 15.129           Subclass 15.129 indent level is 4 [N: with servo control] {G11B 15/675E2A}
 [List of Patents for class g9b subclass 15.13] 15.13           Subclass 15.13 indent level is 4 [N: with ejection damping means] {G11B 15/675E2B}
 [List of Patents for class g9b subclass 15.131] 15.131           Subclass 15.131 indent level is 4 [N: using pneumatic means] {G11B 15/67B}
 [List of Patents for class g9b subclass 15.132] 15.132           Subclass 15.132 indent level is 4 [N: Extracting end of record carrier from container or single reel ( G9B/15.131 takes precedence)] {G11B 15/67C}
 [List of Patents for class g9b subclass 15.133] 15.133           Subclass 15.133 indent level is 4 [N: Threading end of record carrier externally to single reel ( G9B/15.131 takes precedence)] {G11B 15/67D}
 [List of Patents for class g9b subclass 15.134] 15.134           Subclass 15.134 indent level is 4 [N: Threading or attaching end of record carrier on or to single reel ( G9B/15.131 takes precedence)] {G11B 15/67E}
[List of Patents for class g9b subclass 15.135] 15.135           Subclass 15.135 indent level is 2 Automatic cassette changing arrangements; [N: automatic tape changing arrangements] {G11B 15/68}
[List of Patents for class g9b subclass 15.136] 15.136           Subclass 15.136 indent level is 3 [N: with linearly moving rectangular box shaped magazines] [N0101] {G11B 15/68B}
 [List of Patents for class g9b subclass 15.137] 15.137           Subclass 15.137 indent level is 4 [N: in vertical direction] [N0101] {G11B 15/68B1}
 [List of Patents for class g9b subclass 15.138] 15.138           Subclass 15.138 indent level is 4 [N: in horizontal direction] [N0101] {G11B 15/68B2}
[List of Patents for class g9b subclass 15.139] 15.139           Subclass 15.139 indent level is 3 [N: with fixed magazines having fixed cassette storage cells, e.g. in racks] [N0101] {G11B 15/68C}
[List of Patents for class g9b subclass 15.144] 15.144           Subclass 15.144 indent level is 3 [N: with rotatable magazine] [N0101] {G11B 15/68D}
 [List of Patents for class g9b subclass 15.152] 15.152           Subclass 15.152 indent level is 3 [N: the cassettes being conveyed within a cassette storage location, e.g. within a storage bin or conveying by belt] [N0101] {G11B 15/68E}
 [List of Patents for class g9b subclass 15.153] 15.153           Subclass 15.153 indent level is 3 [N: Control of the cassette changing arrangement] [N0101] {G11B 15/68F}
 [List of Patents for class g9b subclass 15.154] 15.154           Subclass 15.154 indent level is 3 [N: Automatic tape changing arrangements] [N0101] {G11B 15/68G}
 [List of Patents for class g9b subclass 15.155] 15.155           Subclass 15.155 indent level is 1 The record carrier being an endless loop record carrier [N: inside container G9B/15.032] {G11B 15/70}
[List of Patents for class g9b subclass 17] 17           Guiding record carriers not specifically of filamentary or web form, or of supports therefor (guiding cards or sheets G06K13/00){G11B 17/00}
 [List of Patents for class g9b subclass 17.001] 17.001           Subclass 17.001 indent level is 1 [N: Programmed access to indexed parts of tracks of operating discs, by guiding the disc] {G11B 17/00A}
[List of Patents for class g9b subclass 17.002] 17.002           Subclass 17.002 indent level is 1 Details {G11B 17/02}
[List of Patents for class g9b subclass 17.003] 17.003           Subclass 17.003 indent level is 2 Positioning or locking of single discs {G11B 17/022}
[List of Patents for class g9b subclass 17.008] 17.008           Subclass 17.008 indent level is 2 [N: Selecting or spacing of record carriers for introducing the heads] {G11B 17/02D}
 [List of Patents for class g9b subclass 17.009] 17.009           Subclass 17.009 indent level is 4 in containers or trays [N: ( G9B/17.01, G9B/17.011 take precedence)] [C9410] {G11B 17/03}
 [List of Patents for class g9b subclass 17.01] 17.01           Subclass 17.01 indent level is 4 Positioning by moving the door or the cover [N: ( G9B/17.011 takes precedence)] [C9410] {G11B 17/032}
 [List of Patents for class g9b subclass 17.011] 17.011           Subclass 17.011 indent level is 4 Positioning by moving the loading station {G11B 17/035}
 [List of Patents for class g9b subclass 17.012] 17.012           Subclass 17.012 indent level is 2 Centering or locking of a plurality of discs in a single cartridge {G11B 17/038}
[List of Patents for class g9b subclass 17.013] 17.013           Subclass 17.013 indent level is 2 Feeding or guiding single record carrier to or from transducer unit [N: (guiding during transducing operation G9B/17.062)] [C9410] {G11B 17/04}
[List of Patents for class g9b subclass 17.014] 17.014           Subclass 17.014 indent level is 3 [N: Details] [N9410] {G11B 17/04A}
[List of Patents for class g9b subclass 17.015] 17.015           Subclass 17.015 indent level is 4 [N: Servo control] [N9410] {G11B 17/04A1}
 [List of Patents for class g9b subclass 17.016] 17.016           Subclass 17.016 indent level is 5 [N: with parallel drive rollers] [N9410] {G11B 17/04A1B}
[List of Patents for class g9b subclass 17.017] 17.017           Subclass 17.017 indent level is 4 [N: Closing mechanism, e.g. door] [N9410] {G11B 17/04A2}
[List of Patents for class g9b subclass 17.019] 17.019           Subclass 17.019 indent level is 3 [N: of disc inside cartridge only ( G9B/17.039 takes precedence)] [N9410] {G11B 17/04C}
[List of Patents for class g9b subclass 17.031] 17.031           Subclass 17.031 indent level is 3 [N: of disc without cartridge only] [N9410] {G11B 17/04D}
 [List of Patents for class g9b subclass 17.038] 17.038