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CLASS 360,	DYNAMIC MAGNETIC INFORMATION STORAGE OR RETRIEVAL
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SECTION I - CLASS DEFINITION

GENERAL STATEMENT OF THE CLASS SUBJECT MATTER

This class is an integral part of Class 369, Dynamic Information Storage or Retrieval, following subclass 18 and is the specific class for apparatus and corresponding processes for the storage and retrieval of information based on relative movement between a magnetic record carrier and a transducer.

This class also includes apparatus and corresponding processes for making copies or editing of records falling within the above definition.

A magnetic record carrier within the meaning of this class is an element which consists of a magnetizable material or is comprised of a coating or impregnation of magnetizable material which is intended for the storage of more than a single bit of information. Storage elements which include discrete magnetic areas, inserts, spots, etc. each intended for the storage of single bits of information, whether or not relative motion is used in transducing that information, are not included in the above definition. See elsewhere for the use of such elements. (See References to Other Classes, below.)

SUBCOMBINATIONS OF DYNAMIC MAGNETIC RECORDERS OR REPRODUCERS

This class includes elements forming subcombinations specific to apparatus within the class definition such as record carriers, transducers, etc.

Electrical circuits not specific to magnetic recording or reproducing which may constitute subcombinations of such apparatus are classified in the appropriate class for such circuits.

Mechanisms forming subcombinations of apparatus within the class definition are classified in the appropriate mechanical class providing for such subject matter unless claimed in significant combination with specific recorder structure.

SECTION II - LINES WITH OTHER CLASSES AND WITHIN THIS CLASS

COMBINATIONS OF OTHER APPARATUS WHICH INCLUDE APPARATUS OF THIS CLASS

Significantly claimed apparatus external to this class, claimed in combination with apparatus under the class definition, which records or reproduces some quality or quantity related to such external apparatus or its function, is classified in the class appropriate to the external apparatus.

Nominally claimed apparatus external to this class, claimed in combination with apparatus under the class definition, is classified in this class unless provided for in the appropriate external class.

Because of the placement of Class 360 into the Class 369 schedule, this class is no longer exhaustive of dynamic magnetic storage or retrieval, as to the art now classified in subclasses 1 through 18 of Class 369.

ORGANIZATION OF THIS CLASS

For the organization of this class, refer to Subclass References to the Current Class, below.

SECTION III - SUBCLASS REFERENCES TO THE CURRENT CLASS

SEE OR SEARCH THIS CLASS, SUBCLASS:

SECTION IV - REFERENCES TO OTHER CLASSES

SEE OR SEARCH CLASS:

SUBCLASSES

1	RECORDING ON OR REPRODUCING FROM AN ELEMENT OF DIVERSE UTILITY
	This subclass is indented under the class definition.  Subject matter which includes recording on or reproducing from an element which has utility in addition to being a magnetic record carrier. (1) Note. Examples of devices classified herein are devices which record on or reproduce from razor blades, tire beads, food cans, price tags, etc. (2) Note. Elements used as record carriers in this and indented subclasses which are not inherently magnetic may have magnetic strips, coatings or other magnetic elements affixed thereto to allow for their use as magnetic record carriers.

2	Card
	This subclass is indented under subclass 1.  Subject matter wherein the element used as a record carrier is in a flat geometric form. SEE OR SEARCH CLASS: 235,  Registers,   subclass 449 and 450 for sensing mechanisms utilized to sense discrete bits of magnetic material, the discrete bits being coded markings on a record. 434,  Education and Demonstration,   subclass 308 and indented subclasses, particularly subclasses 311+ for card shaped elements used in teaching and having information recorded thereon.

3	Motion picture film
	Subject matter under subclasses 1 wherein the element used as a record carrier is a motion picture film. SEE OR SEARCH CLASS: 352,  Optics: Motion Pictures,   subclasses 1+ for sound recording and reproducing combined with motion pictures.

4	MANUAL INPUT RECORDING
	This subclass is indented under the class definition.  Subject matter including apparatus which is to be manually manipulated and it is the manipulation of such apparatus which generates the information signal that is to be recorded. SEE OR SEARCH CLASS: 400,  Typewriting Machines,   appropriate subclasses for machine operators including magnetic records.

5	RECORDING FOR SELECTIVE RETENTION OF A SPECIAL OCCURRENCE
	This subclass is indented under the class definition.  Subject matter for automatically sensing the occurrence of a condition, retaining information concerning that occurrence and deleting or disregarding unwanted information. (1) Note. Examples of devices classified herein are crash, transient and surveillance recorders. SEE OR SEARCH CLASS: 369,  Dynamic Information Storage or Retrieval,   subclasses 47.36 through 47.55for mechanism control by control signal.

6	RECORDING COMBINED WITH METERING OR SENSING
	This subclass is indented under the class definition.  Subject matter in combination with meters or sensors of particular application. (1) Note. See Lines With Other Classes and Within This Class, Combinations of Other Apparatus Which Include Apparatus of This Class, in the Class Definition, above. (2) Note. Examples of devices classified herein are recorders associated with utility meters, sensors of seismic or other natural phenomena and body tissue analyzing devices. (3) Note. Ordinary sound microphones and video cameras are not considered sensors of particular application as defined above. Recorders in combination with such microphones or cameras are classified in subclasses provided below. SEE OR SEARCH CLASS: 346,  Recorders,   subclasses 14 through 18,for non-magnetic recorders combined with registers, indicators or alarms.

7	RECORDING FOR MONETARY DELAY OF AN ANALOG SIGNAL
	This subclass is indented under the class definition.  Subject matter wherein a nondigital signal is recorded and momentarily reproduced for the specific purpose of introducing a delay in the signal. (1) Note. Apparatus classified herein is used for purposes such as censoring and generating artificial reverberation. SEE OR SEARCH THIS CLASS, SUBCLASS: 54, for recirculation or delay of a digital signal.

8	RECORDING FOR CHANGING DURATION, FREQUENCY OR REDUNDANT CONTENT OF AN ANALOG SIGNAL
	This subclass is indented under the class definition.  Subject matter specifically arranged for recording or reproducing a signal in such a manner that the signal, as recorded, has redundant portions deleted therefrom or, as reproduced, occupies a different amount of time or a different band of frequencies than that occupied by the original signal. (1) Note. Changes in either or both of duration and frequency may be produced by the subject matter of this and indented subclasses. SEE OR SEARCH CLASS: 704,  Data Processing: Speech Signal Processing, Linguistics, Language Translation, and Audio Compression/Decompression,   subclasses 500 through 504for bandwidth, or time compression, or expansion of audio signals.

12	RECORDING OR REPRODUCING FOR AUTOMATIC ANNOUNCING
	This subclass is indented under the class definition.  Subject matter for recording or reproducing information in such a manner that an appropriate announcement may be selected or synthesized in response to a sensed condition or predetermined command. (1) Note. Examples of devices classified herein are: Time or temperature announcing machines, talking voltmeters and travelogue reproducers responsive to location. SEE OR SEARCH CLASS: 379,  Telephonic Communications,   subclasses 41 and 67+ for subject matter of this type in combination with a telephone.

13	RECORD EDITING
	This subclass is indented under the class definition.  Subject matter for deleting, adding or rearranging portions of a recording. (1) Note. Both manual cutting and splicing of record carrier portions and reproducing from one record carrier and recording onto the same or another record carrier are included in this subclass.

15	RECORD COPYING
	This subclass is indented under the class definition.  Subject matter for duplicating records. SEE OR SEARCH CLASS: 369,  Dynamic Information Storage or Retrieval,   subclasses 84+ for duplicating nonmagnetic sound records.

16	Contact transfer
	This subclass is indented under subclass 15.  Subject matter wherein a blank record carrier is placed in contact with the record carrier to be copied and duplication occurs at the point of contact.

17	With magnetic bias
	This subclass is indented under subclass 16.  Subject matter wherein a magnetic field in addition to that of the record carrier to be copied is applied at the point of contact.

18	RECORDING OR REPRODUCING PLURAL INFORMATION SIGNALS ON THE SAME TRACK
	This subclass is indented under the class definition.  Subject matter wherein separate information signals are recorded in such a manner that they occupy co-extensive or overlapping areas on a record carrier and, during reproduction, are again separable. (1) Note. Separable components of single signals such as video and synchronizing components of a normal television signal or data and timing components of a digital signal are not considered separate information signals within the meaning of the above definition. SEE OR SEARCH THIS CLASS, SUBCLASS: 33+, for recording television signals including synchronizing components. 39+, for recording digital signals including timing components. SEE OR SEARCH CLASS: 370,  Multiplex Communications,   appropriate subclasses for multiplexing systems and techniques.

20	Frequency multiplex
	This subclass is indented under subclass 18.  Subject matter wherein the separate signals occupy different frequency bands.

21	Head gap azimuth multiplex
	This subclass is indented under subclass 18.  Subject matter wherein the separate signals are recorded using a head or heads with gaps positioned at different angles with respect to the record carrier for each of the separate signals.

22	SPLITTING ONE INFORMATION SIGNAL FOR RECORDING ON PLURAL DISTINCT TRACKS OR REPRODUCING SUCH SIGNAL
	This subclass is indented under the class definition.  Subject matter wherein a single information signal is divided and recorded on plural distinct tracks or reproduced from such tracks and recombined into a single signal. (1) Note. Transverse track portions such as that produced by moving a head at an angle to the direction of movement of a tape are not considered distinct tracks within the meaning of the above definition. SEE OR SEARCH THIS CLASS, SUBCLASS: 26, for electronically correcting phasing errors between signals which may be recorded on plural distinct tracks. 76, for physically moving a multi-track head with respect to a record for skew correction.

23	Time division
	This subclass is indented under subclass 22.  Subject matter wherein the signal is divided into increments separate in time and sequential increments are commutated between plural distinct tracks.

24	SPLITTING, PROCESSING AND RECOMBINING ONE INFORMATION SIGNAL FOR RECORDING OR REPRODUCING ON THE SAME TRACK
	This subclass is indented under the class definition.  Subject matter wherein a signal is divided, the divided portions are separately processed and are then recorded on the same track of a record carrier. (1) Note. Apparatus wherein a single reproduced signal is divided, separately processed and recombined is also included in this subclass. SEE OR SEARCH CLASS: 327,  Miscellaneous Active Electrical Nonlinear Devices, Circuits, and Systems,   subclasses 407+ for miscellaneous gating of plural inputs to a single output.

25	CHECKING RECORD CHARACTERISTICS OR MODIFYING RECORDING SIGNAL FOR CHARACTERISTIC COMPENSATION
	This subclass is indented under the class definition.  Subject matter wherein the characteristics of a particular record carrier are determined or a signal to be recorded is modified to compensate for the determined characteristics of a particular record carrier. (1) Note. Examples of record carrier characteristics are: inhomogeneous magnetic coating, incomplete erasure of a prior recording and peculiar hysteresis. (2) Note. Characteristics of magnetic recording or reproducing which are dictated by physical law and are not attributable to peculiarities of the record carrier are not included in this subclass. SEE OR SEARCH THIS CLASS, SUBCLASS: 65, for equalization circuits.

26	ELECTRONICALLY CORRECTING PHASING ERRORS BETWEEN RELATED INFORMATION SIGNALS
	This subclass is indented under the class definition.  Subject matter which is electronic in nature (e.g., adjustable delay lines, gates, registers) for producing time coincidence between plural related information signals. SEE OR SEARCH THIS CLASS, SUBCLASS: 51, for apparatus which corrects timing errors in a digital signal. 76, for apparatus which physically moves multiple track heads to produce an effect similar to that of the apparatus of this subclass. SEE OR SEARCH CLASS: 386,  Television Signal Processing for Dynamic Recording or Reproducing,   subclass 41 for phase control of carrier signal in a recorded color television signal. 714,  Error Detection/Correction and Fault Detection/Recovery,   the appropriate subclass for an error checking system and subclass 700 for generic skew detection or correction.

27	RECORDING OR REPRODUCING AN INFORMATION SIGNAL AND A CONTROL SIGNAL FOR CONTROLLING ELECTRONICS OF REPRODUCER
	This subclass is indented under the class definition.  Subject matter wherein, during recording of an information signal, a control signal is generated and recorded and is used during reproduction to control the electronic circuitry through which the information signal is processed. (1) Note. The control signal used herein is distinct from or in addition to the normal clock and synchronizing signals associated with digital and video signals, respectively. SEE OR SEARCH THIS CLASS, SUBCLASS: 13+, for magnetic record editing where a recorded control signal may be used. 51, for controlling digital signal reproduction using clock signals. 69+, for controlling the recorder mechanism in response to a recorded control signal. SEE OR SEARCH CLASS: 386,  Television Signal Processing for Dynamic Recording or Reproducing,   subclass 16 for time correction of a recorded color television signal using a recorded reference signal.

28	Reference carrier to control demodulator
	This subclass is indented under subclass 27.  Subject matter wherein the control signal is a recorded reference carrier which is used to control the demodulation of the reproduced information signal.

29	MODULATING OR DEMODULATING
	This subclass is indented under the class definition.  Subject matter including specific modulator or demodulator circuitry or techniques. SEE OR SEARCH CLASS: 329,  Demodulators,   appropriate subclasses for demodulators of general utility. 332,  Modulators,   appropriate subclasses, for modulators and demodulators of general utility.

30	Frequency
	This subclass is indented under subclass 29.  Subject matter including specific frequency modulation or demodulation of a signal.

31	MONITORING OR TESTING THE PROGRESS OF RECORDING
	This subclass is indented under the class definition.  Subject matter wherein, during recording, the recorded information signal is reproduced in whole or in part for qualitative analysis of the operation of the recorder system or a part thereof. SEE OR SEARCH THIS CLASS, SUBCLASS: 25, for record carrier characteristic determination and compensation. 53, for digital data error checking.

32	CONVERTING AN ANALOG SIGNAL TO DIGITAL FORM FOR RECORDING; REPRODUCING AND RECONVERTING
	This subclass is indented under the class definition.  Subject matter including producing a digital equivalent of a nondigital signal for recording, or producing a nondigital equivalent of a reproduced digital signal. SEE OR SEARCH CLASS: 235,  Registers,   subclasses 321+ , for analog-digital converters.

39	GENERAL PROCESSING OF A DIGITAL SIGNAL
	This subclass is indented under the class definition.  Subject matter of specific utility in treating a digital signal for recording or reproducing. (1) Note. This subclass is the residual area for devices and methods concerned with processing digital signals in a manner not provided for above. Digital signal processing properly classified above should not, as a matter of course, be cross-referenced here. (2) Note. Although specific mechanical apparatus may be included in the subject matter of this and indented subclasses, the subject matter herein remains generally electronic in nature and its utility is in distinctive handling of a digital signal. SEE OR SEARCH THIS CLASS, SUBCLASS: 55+, for generally usable recording or reproducing techniques. 69+, for automatically controlling recorder or reproducer mechanisms. 79, for recorder or reproducer control of an external device 81+, 88 and 101, for recorder or reproducer mechanisms. 220 through 224, 230-237.1, 240-246.8, 110-130.34, and 131-136, for recorder or reproducer elements. SEE OR SEARCH CLASS: 178,  Telegraphy,   appropriate subclasses, particularly 17+ for code recorders. 235,  Registers,   subclasses 61+ , for calculators combined with recorders. 326,  Electronic Digital Logic Circuitry,   for electronic digital circuits operating on a digital signal. 327,  Miscellaneous Active Electrical Nonlinear Devices, Circuits, and Systems,   subclasses 1+ for pulse discriminating or selecting and subclasses 100+ for pulse parameter (e.g., amplitude) control. 341,  Coded Data Generation or Conversion,   subclass 15 for a magnetic pattern reading type analog to digital converter and subclasses 50+ for code converters. 365,  Static Information Storage and Retrieval,   appropriate subclass for the static storage/retrieval of information. 700,  Data Processing: Generic Control Systems or Specific Applications,   subclasses 1 through 89for general-purpose digital control systems (e.g., computer arrangements for open and closed loop feedback control). 708,  Electrical Computers: Arithmetic Processing and Calculating,   subclasses 100+ for digital calculating computers and generic digital arithmetic processing circuits and methods. 711,  Electrical Computers and Digital Processing Systems: Memory,   subclasses 1+ for addressing combined with specific memory configurations (e.g., extended, expanded, dynamic, etc.) in a digital data processing system, subclasses 100+ for generalized address forming, and subclasses 200+ for generalized storage accessing and control in a digital data processing system. 714,  Error Detection/Correction and Fault Detection/Recovery,   subclasses 1+ for reliability and availability in a digital data processing system.

40	In specific code or form
	This subclass is indented under subclass 39.  Subject matter including generating a waveform from digital data or reproducing such a waveform, the frequency, shape, polarity or other characteristic thereof being indicative of the digital data. SEE OR SEARCH CLASS: 341,  Coded Data Generation or Conversion,   appropriate subclasses for code converters.

41	Nonreturn to zero
	This subclass is indented under subclass 40.  Subject matter wherein a first or opposite polarization of the record throughout an entire bit cell is indicative of a first or second binary digit and transitions in polarity occur only between unlike digits. Example:

42	Phase code
	This subclass is indented under subclass 40.  Subject matter wherein a transition in polarity in a first direction is indicative of a first binary digit and a transition in polarity in an opposite direction is indicative of the second binary digit. Example:

43	Multi-frequency
	This subclass is indented under subclass 40.  Subject matter wherein a first binary digit is indicated by one full cycle of the waveform per bit cell and the second binary digit is indicated by one-half cycle of the waveform per bit cell. Example:

44	Intra-cell transition
	This subclass is indented under subclass 40.  Subject matter wherein a transition in polarity occurs within the boundaries of each bit cell and the position of that transition is indicative of the data recorded. Example:

45	Pulse crowding correction
	This subclass is indented under subclass 39.  Subject matter wherein the fringing effects of high density recording are subdued.

46	Head amplifier circuit
	This subclass is indented under subclass 39.  Subject matter including circuitry proximate to the recording transducer for producing sufficient current in response to an input signal to properly polarize the record.

47	Redundant or complimentary tracks
	This subclass is indented under subclass 39.  Subject matter wherein the same data is recorded in plural tracks in the same or complimentary forms.

48	Data in specific format
	This subclass is indented under subclass 39.  Subject matter wherein the data is recorded in words or blocks of specific numbers of bits or wherein words or blocks of data are arranged in a specific manner on the record.

49	Address coding
	This subclass is indented under subclass 39.  Subject matter including specific patterns of digits which are used to indicate the location of selected blocks of data. SEE OR SEARCH THIS CLASS, SUBCLASS: 72, for automatically positioning a par- ticular portion of a record carrier at a transducing station.

50	Inter-record gap processing
	This subclass is indented under subclass 39.  Subject matter including controlling the spacing between blocks of data.

51	Data clocking
	This subclass is indented under subclass 39.  Subject matter including developing or using a timing signal for gating digits or data during recording or reproducing. SEE OR SEARCH THIS CLASS, SUBCLASS: 26, for electronic skew correction using data clocking.

52	With incremental movement between record and head
	This subclass is indented under subclass 51.  Subject matter including producing an increment of movement between record and head for each digit of data transduced.

53	Data verification
	This subclass is indented under subclass 39.  Subject matter including checking reproduced data for errors in content. SEE OR SEARCH CLASS: 714,  Error Detection/Correction and Fault Detection/Recovery,   appropriate subclasses for error checking system.

54	Data recirculation
	This subclass is indented under subclass 39.  Subject matter including recording, reproducing and re-recording data in one continuing operation. SEE OR SEARCH THIS CLASS, SUBCLASS: 7, for momentary delay of an analog signal.

55	GENERAL RECORDING OR REPRODUCING
	This subclass is indented under the class definition.  Subject matter including the use of magnetic or other physical phenomena, specific techniques or specific circuitry for magnetically recording or reproducing information in any signal form. (1) Note. This subclass is the residual area for devices and methods concerned with processing of signals in a manner not provided for above. Subject matter properly classified above should not, as a matter of course, be cross-referenced here. (2) Note. Documents including general descriptions of the phenomena of magnetic recording but are principally concerned with mechanisms or elements falling within the class definition should not be classified in this subclass. See mechanism or element subclasses below.

57	Selective erase recording
	This subclass is indented under subclass 55.  Subject matter including recording information by selectively erasing a prerecorded signal.

58	Boundary displacement recording or transducers
	This subclass is indented under subclass 55.  Subject matter including shifting the boundary between oppositely polarized regions of a record carrier in response to an information signal.

59	Thermomagnetic recording or transducers
	This subclass is indented under subclass 55.  Subject matter including changing the coercivity of a record carrier by applying heat thereto in proportion to an information signal or in addition to a magnetic field which is proportional to an information signal. SEE OR SEARCH THIS CLASS, SUBCLASS: 16+, for thermo-magnetic record copying. SEE OR SEARCH CLASS: 346,  Recorders,   subclass 74.2 , for thermo- magnetic pictorial recording.

60	Recording-or erasing-prevention
	This subclass is indented under subclass 55.  Subject matter including sensing or indicating the existence of an earlier recording on a record carrier and preventing erasure or double exposure of the carrier. SEE OR SEARCH CLASS: 705,  Data Processing: Financial, Business Practice, Management, or Cost/Price Determination,   subclasses 51 through 54for usage protection of a distributed data file.

61	Signal switching
	This subclass is indented under subclass 55.  Subject matter including specific switching elements or techniques within the information signal circuitry. SEE OR SEARCH CLASS: 200,  Electricity: Circuit Makers and Breakers,   appropriate subclasses, for switching devices. 307,  Electrical Transmission or Interconnection Systems,   subclasses 112+ for class appropriate switching systems. 327,  Miscellaneous Active Electrical Nonlinear Devices, Circuits, and Systems,   subclasses 365+ for miscellaneous gating circuits.

62	Record-reproduce
	This subclass is indented under subclass 61.  Subject matter wherein the switching accomplishes a change between recording and reproducing modes of operation.

63	Between plural stationary heads
	This subclass is indented under subclass 61.  Subject matter wherein the switching accomplishes the selection of one or more of a plurality of stationary transducers.

64	Between heads in alternate engagement with medium
	This subclass is indented under subclass 61.  Subject matter wherein the switching accomplishes the selection of that transducer which is in engagement with the record carrier from a plurality of transducers which are alternately in engagement with the record carrier.

65	Specifics of equalizing
	This subclass is indented under subclass 55.  Subject matter including specific circuitry or techniques for correcting the inherent nonlinear frequency characteristics of magnetic recording or reproducing. SEE OR SEARCH THIS CLASS, SUBCLASS: 24, for split signal equalizers. 25, for compensating for record carrier peculiarities. SEE OR SEARCH CLASS: 333,  Wave Transmission Lines and Networks,   subclass 28 and the classes indicated in the definition of that subclass for equalizers in general.

66	Specifics of biasing or erasing
	This subclass is indented under subclass 55.  Subject matter including specific circuitry or techniques for correcting the inherent nonlinear amplitude characteristics of magnetic recording or for erasing existing recordings. SEE OR SEARCH THIS CLASS, SUBCLASS: 25, for modifying information or bias signal to accommodate for record carrier characteristics. SEE OR SEARCH CLASS: 331,  Oscillators,   appropriate subclasses, for oscillators usable in biasing or erasing.

67	Specifics of the amplifier
	This subclass is indented under subclass 55.  Subject matter including specific circuitry or techniques for amplifying an information signal. SEE OR SEARCH CLASS: 330,  Amplifiers,   appropriate subclasses, for amplifiers usable in magnetic recording or reproducing.

68	Recording amplifier
	This subclass is indented under subclass 67.  Subject matter wherein the amplification is specifically adapted for recording.

69	AUTOMATIC CONTROL OF A RECORDER MECHANISM
	This subclass is indented under the class definition.  Subject matter which, without proximate human intervention, will actively control a recorder or reproducer mechanism. (1) Note. Apparatus of this and indented subclasses usually require the sensing of a control signal from the record carrier to control the recorder or reproducer mechanism. However, devices responsive to signals emanating from external devices, or devices responsive to control signals which normally accompany or are a part of an information signal to be recorded or reproduced, are also included in this and indented subclasses. (2) Note. The signal sensed from the record carrier may be a signal which was magnetically recorded thereon or an electrical or mechanical signal generated by mechanically, electrically or optically sensing an attachment to or modification of the record carrier. SEE OR SEARCH CLASS: 226,  Advancing Material of Indeterminate Length,   subclasses 10+ , for material- responsive control means. 242,  Winding, Tensioning, or Guiding,   subclasses 324+ for means for unwinding and rewinding a machine convertible information carrier; e.g., a magnetic tape, particularly subclasses 333+ for automated stop or reversal control for the carrier, subclasses 334+ for a carrier speed or tension control, and subclass 357 for a detector or stop. 318,  Electricity: Motive Power Systems,   appropriate subclasses, particularly 560+, for automatic motor control devices.

70	Synchronizing moving-head moving-record recorders
	This subclass is indented under subclass 69.  Subject matter including controlling the speed or position of movement of a head with respect to a moving record carrier or vice versa. (1) Note. This subclass includes rotating head pressure shoe servos.

71	Controlling the record
	This subclass is indented under subclass 69.  Subject matter including controlling record carrier movement or position with respect to a transducing position.

72.1	Locating specific areas:
	This subclass is indented under subclass 71.  Subject matter wherein the record carrier movement is controlled to bring selected areas of the record into operative position at the recording head to transduce the information recorded thereat. SEE OR SEARCH THIS CLASS, SUBCLASS: 13+, for editing magnetic records which may involve locating specific areas. 74.1, for stopping and reversing per se.

72.2	Responsive to recorded address:
	This subclass is indented under subclass 72.1.  Subject matter wherein the record carrier has address signals recorded thereon and these are read to locate the selected area. SEE OR SEARCH CLASS: 386,  Television Signal Processing for Dynamic Recording or Reproducing,   subclass 95 for recording of television signal with another signal and subclass 79 for locus or track control having a control signal recorded on the medium.

72.3	Responsive to tape transport:
	This subclass is indented under subclass 72.1.  Subject matter wherein the transport mechanism itself is monitored to control the location of the selected area (e.g., reel or capstan shaft rotation).

73.01	Speed:
	This subclass is indented under subclass 71.  Subject matter which controls the speed of a record carrier past a transducing position.

73.02	Control of relative speed between carriers:
	This subclass is indented under subclass 73.01.  Subject matter which controls the difference in speed between plural record carriers.

73.03	Rotary carrier:
	This subclass is indented under subclass 73.01.  Subject matter including structure to advance the record medium in a circular path past the transducing position.

73.04	Linear carrier:
	This subclass is indented under subclass 73.01.  Subject matter in which the motion of the record carrier is substantially along a single axis.

73.05	Plural speed transport:
	This subclass is indented under subclass 73.04.  Subject matter having structure to provide differing speeds for the record carrier.

73.06	Automatic change between fixed speeds:
	This subclass is indented under subclass 73.05.  Subject matter for changing between two predetermined speeds in the same direction in response to a sensed condition or signal. SEE OR SEARCH THIS CLASS, SUBCLASS: 74.1+, for stopping and reversing of a magnetic record carrier.

73.07	Automatic selection of carrier or track speed:
	This subclass is indented under subclass 73.05.  Subject matter for selection of the speed of advance of the carrier in response to a record carrier or track parameter.

73.08	Variable speed:
	This subclass is indented under subclass 73.05.  Subject matter including adjustment or variation of the speed of the record carrier.

73.09	Constant speed:
	This subclass is indented under subclass 73.04.  Subject matter for advancing an elongate record carrier past a transducing position at a constant speed.

73.11	By reproduced control signal and transport derived signal:
	This subclass is indented under subclass 73.09.  Subject matter wherein the speed of the record carrier is controlled by a signal reproduced from the record carrier and a signal sensed by a condition of the carrier advancing mechanism.

73.12	By reproduced control signal:
	This subclass is indented under subclass 73.09.  Subject matter wherein a constant speed record carrier advancing mechanism is controlled by a signal reproduced from the carrier.

73.13	From separate track:
	This subclass is indented under subclass 73.12.  Subject matter wherein the control signal is stored on a track on the record carrier distinct from other information recorded thereon.

73.14	By signal derived from transport:
	This subclass is indented under subclass 73.09.  Subject matter wherein the speed of the record carrier is controlled by a signal sensed by a condition of the carrier advancing mechanism. SEE OR SEARCH THIS CLASS, SUBCLASS: 73.11, for record carrier speed control by a signal derived from the record transport combined with a signal reproduced from the record carrier.

74.1	Stopping or reversing:
	This subclass is indented under subclass 71.  Subject matter wherein stopping or reversing of the record carrier"s movement is controlled.

74.2	Responsive to real rotation:
	This subclass is indented under subclass 74.1.  Subject matter where the stopping or reversing is controlled by detecting stoppage of reel rotation.

74.3	Responsive to tape tension:
	This subclass is indented under subclass 74.1.  Subject matter where the stopping or reversing is controlled by detecting a predetermined tape tension. (1) Note. The subject matter of this subclass includes detecting the absence of tape.

74.4	Responsive to magnetic recorded signals:
	This subclass is indented under subclass 74.1.  Subject matter where signals are magnetically recorded on the record and the stopping or reversing is controlled by detecting these signals. (1) Note. The subject matter of this subclass includes sensing the absence of the magnetic signals. (2) Note. The magnetic signals are either the information signals or separate control signals recorded on the record.

74.5	Responsive to physical property of record:
	This subclass is indented under subclass 74.1.  Subject matter where the stopping or reversing is controlled by detecting a physical property of the record (i.e., notch, slot, etc.).

74.6	Photoelectric:
	This subclass is indented under subclass 74.5.  Subject matter where a portion of the record has a light transmitting or reflecting property that differs from the rest of the record and photoelectric means are used to detect such to control the stopping or reversing.

74.7	Conductive:
	This subclass is indented under subclass 74.5.  Subject matter where a portion of the record has an electrical conductivity that differs from the rest of the record and the stopping or reversing is controlled by detecting such.

75	Controlling the head
	This subclass is indented under subclass 69.  Subject matter including controlling head position. SEE OR SEARCH CLASS: 386,  Television Signal Processing for Dynamic Recording or Reproducing,   subclasses 6 through 8for controlling head position during fast, slow, or stop reproduction of a recorded color television signal.

76	Azimuth or skew
	This subclass is indented under subclass 75.  Subject matter wherein the angle between head gap or gaps and record track or tracks is controlled.

77.01	Track centering:
	This subclass is indented under subclass 75.  Subject matter for aligning a transducer head with the midpoint of a continuous information containing path. SEE OR SEARCH CLASS: 369,  Dynamic Information Storage or Retrieval,   subclasses 43+ for a transducer tracking servomechanism in a nonmagnetic dynamic recording or reproducing device. 428,  Stock Material or Miscellaneous Articles,   subclass 845.6 for magnetic storage medium having backcoat layer for servo tracking, with specific physical chemistry or chemical composition; and subclass 848.5 for magnetic storage medium having specified pits, tracks, or indicia with specific physical chemistry or chemical composition.

77.02	Rotary carrier:
	This subclass is indented under subclass 77.01.  Subject matter which controls a transducer centering position relative to a circular revolving medium.

77.03	By nonmagnetic sensing (e.g., optical, capacitive):
	This subclass is indented under subclass 77.02.  Subject matter responsive to a signal produced in response to a property of the record carrier other than a magnetic property, or by a nonmagnetic auxiliary element. (1) Note. Such an auxiliary element may include a potententiometer, or an optical grating, mechanically coupled to the transducer element. SEE OR SEARCH CLASS: 369,  Dynamic Information Storage or Retrieval,   subclass 14 for simultaneous magnetic and nonmagnetic signal reproduction; subclasses 43+ for servo positioning of a nonmagnetic reproduction transducer; subclasses 100+ for signal reproduction from an optical track; and subclass 126 for signal reproduction from a capacitive track.

77.04	By memory storage of repeatable error or correction:
	This subclass is indented under subclass 77.02.  Subject matter including a signal storage device which is used to generate a transducer head position control signal.

77.05	By servo signal component from carrier surface separate from information signal bearing surface:
	This subclass is indented under subclass 77.02.  Subject matter wherein the record carrier includes two surfaces one of which has a continuous path along which an information signal is stored and the other has a continuous path along which at least a component of a transducer head positioning servo control signal is stored.

77.06	Reproduced data signal used for tracking:
	This subclass is indented under subclass 77.02.  Subject matter for processing a reproduced information signal to control the transducer position.

77.07	By tracking signal recorded on or immediately beneath surface:
	This subclass is indented under subclass 77.02.  Subject matter for processing a signal reproduced from the record carrier for controlling transducer head motion and which signal is distinct from a reproduced information signal.

77.08	Distinct servo sector:
	This subclass is indented under subclass 77.07.  Subject matter wherein a transducer head motor control signal is stored in a disk sector distinct from sectors containing information signals.

77.11	Continuous servo signal:
	This subclass is indented under subclass 77.07.  Subject matter wherein the record carrier includes a continuous path along which a transducer positioning servo control signal is stored.

77.12	Elongate web carrier (i.e., tape):
	This subclass is indented under subclass 77.01.  Subject matter wherein the transducer head is aligned with the midpoint of a track on a record carrier the length of which is much greater than its width.

77.13	Transverse scan path:
	This subclass is indented under subclass 77.12.  Subject matter where the resultant motion of the transducer head is at an angle to the forward motion of the record carrier.

77.14	By pilot signal:
	This subclass is indented under subclass 77.13.  Subject matter wherein the centering of the transducer head over the transverse track on the record carrier is controlled by a reference signal recorded on the transverse track.

77.15	Plural pilot signals along single transverse path:
	This subclass is indented under subclass 77.14.  Subject matter wherein multiple reference signals recorded along a transverse track on the record carrier are used to control the motion of the transducer head.

77.16	Having head deflection drive (e.g., piezoelectric bimorph):
	This subclass is indented under subclass 77.13.  Subject matter having an electrostatically actuated device for moving the transducer head.

77.17	Dithering:
	This subclass is indented under subclass 77.16.  Subject matter in which a low amplitude A.C. signal is applied to the transducer head deflection drive.

78.01	Track changing:
	This subclass is indented under subclass 75.  Subject matter having structure to change the path of the head on the record medium from one continuous information containing path to another.

78.02	Tape:
	This subclass is indented under subclass 78.01.  Subject matter wherein the length of the record carrier is much greater than its width.

78.03	Plural tapes:
	This subclass is indented under subclass 78.02.  Subject matter wherein the transducer head changes between tracks on plural magnetic tapes.

78.04	For rotary carrier (e.g., disc):
	This subclass is indented under subclass 78.01.  Subject matter which causes a change in transducing position between tracks on a record carrier moving in circular motion.

78.05	Coarse and fine head drive motors:
	This subclass is indented under subclass 78.04.  Subject matter in which the transducer head is moved over the disk by plural motors having different resolution.

78.06	Specified velocity pattern during access:
	This subclass is indented under subclass 78.04.  Subject matter having a device for moving the transducer head in a particular sequence of velocities to access the desired track.

78.07	Controlled by memory device:
	This subclass is indented under subclass 78.06.  Subject matter having a signal storage device which is used to generate a transducer head velocity control signal.

78.08	Specified spatial pattern during access:
	This subclass is indented under subclass 78.04.  Subject matter wherein the motion of the transducer head between tracks has at least one controlled change in direction.

78.09	Including model of servo system or element:
	This subclass is indented under subclass 78.04.  Subject matter in which the track changing arrangement includes a device which simulates the operation of a servo system which controls the motion of a transducer head, or a component of such a system.

78.11	Including nonmagnetic position sensing:
	This subclass is indented under subclass 78.04.  Subject matter having track changing structure responsive to a signal produced in response to a property of the record carrier other than a magnetic property, or by a nonmagnetic auxiliary element. (1) Note. Such an auxiliary element may include a potententiometer, or an optical grating, mechanically coupled to the transducer element. SEE OR SEARCH CLASS: 369,  Dynamic Information Storage or Retrieval,   subclasses 13.01 through 14for combined magnetic and nonmagnetic (e.g., magneto-optical) signal reproduction, subclasses 30.01-30.99 for track selection in a nonmagnetic reproducing arrangement, subclasses 100-125 for signal reproduction from an optical track, and subclass 126 for signal reproduction from a capacitive track.

78.12	Including particular head actuator:
	This subclass is indented under subclass 78.04.  Subject matter including a detail of a transducer head moving mechanism.

78.13	Stepping motor:
	This subclass is indented under subclass 78.12.  Subject matter wherein the head is moved by an electric motor which produces motion in a series of discrete steps.

78.14	By recorded servo reference or address signal:
	This subclass is indented under subclass 78.04.  Subject matter wherein the head is controlled by a reproduced signal representing the position or address of the transducer head on the record carrier disk.

78.15	Drum:
	This subclass is indented under subclass 78.04.  Subject matter wherein the transducer head moves between tracks on the curved surface of a cylindrical record carrier.

79	RECORDER CONTROL OF AN EXTERNAL DEVICE
	This subclass is indented under the class definition.  Subject matter wherein a signal sensed from the record carrier is used to control an external device. (1) Note. The signal sensed from the record carrier may be a signal which was magnetically recorded thereon or an electrical or mechanical signal generated by mechanically, electrically or optically sensing an attachment to or modification of the record carrier. (2) Note. A device which is extraneous to the normal function of recorders such as a printer for printing a label on the record from which the control signal is developed, although included within the same housing as the recorder, is considered an external device. SEE OR SEARCH CLASS: 318,  Electricity: Motive Power Systems,   subclasses 567+ and classes indicated in the search notes thereunder, for program or pattern controlled devices.

80	Slide or movie projectors
	This subclass is indented under subclass 79.  Subject matter wherein the external device is a slide or movie projector. SEE OR SEARCH CLASS: 352,  Optics: Motion Pictures,   subclasses 15+ , for this subject matter with significant motion picture structure. 353,  Optics: Image Projectors,   subclasses 15+ , for this subject matter with significant slide projector structure.

81	RECORD TRANSPORT WITH HEAD MOVING DURING TRANSDUCING
	This subclass is indented under the class definition.  Subject matter including a specific mechanism for moving a record carrier past a head which is also moving relative to both record carrier and the mechanism base during the recording or reproducing process. SEE OR SEARCH THIS CLASS, SUBCLASS: 101, and 270-274, for moving head mounting means. SEE OR SEARCH CLASS: 369,  Dynamic Information Storage or Retrieval,   subclass 97 for storage or retrieval by other than magnetic recording or reproduction with transverse head motion.

82	Belt record
	This subclass is indented under subclass 81.  Subject matter wherein the record carrier is in the form of a closed loop.

83	Tape record
	This subclass is indented under subclass 81.  Subject matter wherein the record carrier is in the form of an elongated tape. SEE OR SEARCH CLASS: 226,  Advancing Material of Indeterminate Length,   appropriate subclasses, for tape drive means. 242,  Winding, Tensioning, or Guiding,   subclasses 324+ for means for unwinding and rewinding a machine convertible information carrier; e.g., a magnetic tape, particularly subclasses 333+ for automated stop or reversal control for the carrier, subclasses 334+ for a carrier speed or tension control, and subclass 357 for a detector or stop.

84	Rotating head
	This subclass is indented under subclass 83.  Subject matter wherein the movement of the head is a rotational movement.

85	Tape in container
	This subclass is indented under subclass 84.  Subject matter wherein the record carrier is enclosed in a removable container. SEE OR SEARCH CLASS: 242,  Winding, Tensioning, or Guiding,   subclass 324.2 , 326+, and 335+ for a cartridge storage for a magnet carrier.

86	Disk record
	This subclass is indented under subclass 81.  Subject matter wherein the record carrier is in the form of a disk.

87	Drum record
	This subclass is indented under subclass 81.  Subject matter wherein the record carrier is in the form of a drum.

88	RECORD TRANSPORT WITH HEAD STATIONARY DURING TRANSDUCING
	This subclass is indented under the class definition.  Subject matter including a specific mechanism for moving a record carrier past a head which is stationary during the recording or reproducing process. SEE OR SEARCH CLASS: 369,  Dynamic Information Storage or Retrieval,   subclasses 258+ , for nonmagnetic devices of this type.

89	Wire record
	This subclass is indented under subclass 88.  Subject matter wherein the record carrier is in the form of a wire. SEE OR SEARCH CLASS: 242,  Winding, Tensioning, or Guiding,   subclasses 324.1+ for a wire-type, magnetic, signal carrier.

90	Tape record
	This subclass is indented under subclass 88.  Subject matter wherein the record carrier is in the form of a tape. SEE OR SEARCH CLASS: 226,  Advancing Material of Indeterminate Length,   appropriate subclasses for tape drive means. 242,  Winding, Tensioning, or Guiding,   subclasses 324+ for a device for unwinding and rewinding a machine convertible information carrier; e.g., a magnetic tape or image film.

91	Plural tapes
	This subclass is indented under subclass 90.  Subject matter including means for handling a plurality of tapes. SEE OR SEARCH CLASS: 352,  Optics: Motion Pictures,   subclass 6 and 123, for multiple motion picture recorders and reproducers.

92.1	Tape in container:
	This subclass is indented under subclass 91.  Subject matter wherein the plural tapes are enclosed in single or plural containers.

93	Tape in container
	This subclass is indented under subclass 90.  Subject matter wherein the tape is enclosed in a removable container. SEE OR SEARCH CLASS: 242,  Winding, Tensioning, or Guiding,   subclass 324.2 , 326+, and 335+ for a cartridge storage for an information bearing carrier.

94	Transport accommodates different types
	This subclass is indented under subclass 93.  Subject matter including means for accommodating or for adapting the recorder for use with different types of record containers. SEE OR SEARCH CLASS: 242,  Winding, Tensioning, or Guiding,   subclass 336 for an adaptive or convertible cartridge or cartridge utilization device adapting a cartridge for a magnetic tape or the like to be used with different components.

95	With tape extraction
	This subclass is indented under subclass 93.  Subject matter including means for extracting a portion of the tape from the container.

96.1	Plural reels:
	This subclass is indented under subclass 93.  Subject matter wherein the tape is wound on plural reels within the container. SEE OR SEARCH CLASS: 242,  Winding, Tensioning, or Guiding,   subclasses 335+ , particularly subclasses 341+ for a cartridge containing separate supply and take-up coils.

96.2	With dual capstan drive:
	This subclass is indented under subclass 96.1.  Subject matter including dual capstan drive for moving the tape.

96.3	Reel drive details:
	This subclass is indented under subclass 96.1.  Subject matter including details of the reel drive mechanism. SEE OR SEARCH CLASS: 242,  Winding, Tensioning, or Guiding,   subclass 340 and 349+ for a particular coil drive.

96.4	With common capstan drive:
	This subclass is indented under subclass 96.3.  Subject matter wherein a single motor provides both the reel and capstan drive.

96.51	Container mounting details:
	This subclass is indented under subclass 96.1.  Subject matter includes details of the container mounting mechanism. (1) Note. This subclass and its indents also include container mounting structure where there is only a nominal recitation of the transport. SEE OR SEARCH CLASS: 242,  Winding, Tensioning, or Guiding,   subclasses 338 through 242and subclass 339 for details of a cartridge mounting.

96.61	With pivotal holder
	This subclass is indented under subclass 96.51.  Subject matter wherein the container mounting mechanism includes a pivoted container holder that moves in an arc between a container loading position and a transducing position.

97.01	Disk record:
	This subclass is indented under subclass 88.  Subject matter in which the record carrier is a flat circular element. (1) Note. The mechanism for imparting motion for recording and reproduction is generally in a drive assembly and rotates the disk about its axis of symmetry. SEE OR SEARCH CLASS: 341,  Code Data Generation or Conversion,   subclass 15 for a digital pattern reading code converter or generator with a magnetic code disk.

97.02	Environmental control (e.g., air filter, temperature control):
	This subclass is indented under subclass 97.01.  Subject matter wherein an ambient condition of the disk drive is controlled.

97.03	Plural disks:
	This subclass is indented under subclass 97.02.  Subject matter for varying or maintaining an environmental condition for a disk drive which has structure for concurrent accommodation of multiple disks.

97.04	Flexible disk:
	This subclass is indented under subclass 97.02.  Subject matter for varying or maintaining an environmental condition in a disk drive for a disk record carrier which is bendable or pliable without permanent change.

98.01	Plural disks:
	This subclass is indented under subclass 97.01.  Subject matter including structure for concurrent accommodation of multiple disks.

98.02	Axially fixed flexible disks:
	This subclass is indented under subclass 98.01.  Subject matter having structure for holding multiple flexible disks about a common axis.

98.03	With pneumatic partioning of disks:
	This subclass is indented under subclass 98.02.  Subject matter with separation of a stack of flexible disks by use of a flowing stream of air.

98.04	Changer:
	This subclass is indented under subclass 98.01.  Subject matter for selectively moving a disk to the rotating mechanism in the drive.

98.05	Control detail:
	This subclass is indented under subclass 98.04.  Subject matter including a detail of a changer motion controlling mechanism.

98.06	Mechanical detail:
	This subclass is indented under subclass 98.04.  Subject matter including a detail of disk manipulating structure.

98.07	Rotational drive detail:
	This subclass is indented under subclass 98.01.  Subject matter including a structural detail of the disk rotating device in the drive.

98.08	Seating of disks:
	This subclass is indented under subclass 98.01.  Subject matter including a feature for retaining one of the disks in or on a disk rotating device.

99.01	Flexible disk:
	This subclass is indented under subclass 97.01.  Subject matter wherein the disk record carrier is bendable or pliable without permanent change.

99.02	Loading or ejecting mechanism:
	This subclass is indented under subclass 99.01.  Subject matter for moving the disk to or from the drive location where recording or reproduction is performed.

99.03	Motorized:
	This subclass is indented under subclass 99.02.  Subject matter wherein the loading or ejecting mechanism is operated by an electric motor.

99.04	Rotational drive detail:
	This subclass is indented under subclass 99.01.  Subject matter including a structural detail of the disk rotating device in the drive.

99.05	Disk seating:
	This subclass is indented under subclass 99.01.  Subject matter for retaining the flexible disk in or on a disk rotating device.

99.06	Loading or ejecting mechanism:
	This subclass is indented under subclass 97.01.  Subject matter for moving the disk to or from the drive location where recording or reproduction is performed.

99.07	Motorized:
	This subclass is indented under subclass 99.06.  Subject matter wherein the loading or ejecting mechanism is operated by an electric motor.

99.08	Rotational drive detail:
	This subclass is indented under subclass 97.01.  Subject matter including a structural detail of the disk rotating device in the drive.

99.09	Movable drive:
	This subclass is indented under subclass 99.08.  Subject matter for moving the drive to a disk storage location.

99.11	Stationary drive:
	This subclass is indented under subclass 99.08.  Subject matter with structure to move a disk from a storage location to the drive.

99.12	Disk seating:
	This subclass is indented under subclass 97.01.  Subject matter including a feature for retaining the disk in or on a disk rotating device.

100.1	Drum record:
	This subclass is indented under subclass 88.  Subject matter in which the record carrier is the curved surface of a cylindrical element.

101	HEAD TRANSPORT WITH RECORD STATIONARY DURING TRANSDUCING
	This subclass is indented under the class definition.  Subject matter including a specific mechanism for moving a head past a record carrier which is stationary during the recording or reproducing process. SEE OR SEARCH THIS CLASS, SUBCLASS: 81, for moving-head and moving-record devices.

110	HEAD
	This subclass is indented under the class definition.  Subject matter including specific structure of a transducer. SEE OR SEARCH CLASS: 29,  Metal Working,   subclass 603 , for methods of manufacturing magnetic transducers. 336,  Inductor Devices,   appropriate sub- classes, for inductors in general. 428,  Stock Material or Miscellaneous Articles,   subclasses 810 through 816for magnetic recording component or stock with specified composition or physical chemistry, such as microstructure, or property resulting from microstructure, composition, or chemistry.

111	Flux gate
	This subclass is indented under subclass 110.  Subject matter wherein the intensity of the flux emanating from a record is determined by applying a carrier wave to the head and detecting the modulation of that carrier wave caused by the flux. (1) Note. Excitation circuitry for flux gate heads is included herein. SEE OR SEARCH CLASS: 324,  Electricity: Measuring and Testing,   subclasses 253+ , for magnetometers.

112	Hall effect
	This subclass is indented under subclass 110.  Subject matter wherein the intensity of the flux emanating from a record is determined by generating an electric field in an element exhibiting the Hall effect and detecting the modulation of the field caused by the flux. SEE OR SEARCH CLASS: 324,  Electricity: Measuring and Testing,   subclass 251 , for Hall effect magnetic sensors in general. 365,  Static Information Storage and Retrieval,   subclass 9 for Hall effect magnetic bubble devices, subclass 170 for static storage systems which use Hall effect devices.

114.01	Read only detector using light for reading magnetically recorded information on tape:
	This subclass is indented under subclass 110.  Subject matter wherein the intensity of the flux emanating from a record in the form of a tape is determined by directing a beam of polarized light at the tape and detecting the rotation of polarization caused by the flux.

114.02	Light beam generator detail:
	This subclass is indented under subclass 114.01.  Subject matter including specifics of a structure generating the light beam.

114.03	Focus detail:
	This subclass is indented under subclass 114.02.  Subject matter including specifics of a structure providing focus of the light beam.

114.04	Beam splitter detail:
	This subclass is indented under subclass 114.01.  Subject matter including specifics of a structure dividing the light beam into multiple parts.

114.05	Readout detector detail:
	This subclass is indented under subclass 114.01.  Subject matter including specifics of a structure receiving the light beam after it interacts with the flux on the tape and analyzes the light beam to determine its rotation.

114.06	Focus detail:
	This subclass is indented under subclass 114.05.  Subject matter including specifics of a structure providing focus of the light beam after it interacts with the flux on the tape.

114.07	Circuit detail:
	This subclass is indented under subclass 114.05.  Subject matter including specifics of the circuit used in analyzing the light beam after it interacts with the flux on the tape.

114.08	Detector material detail:
	This subclass is indented under subclass 114.05.  Subject matter including specifics of the material used for the detector.

114.09	Mounting detail:
	This subclass is indented under subclass 114.05.  Subject matter including specifics of a structure used to attach the detector on the tape recorder.

114.1	Rotary head:
	This subclass is indented under subclass 114.01.  Subject matter wherein the read only detector is utilized in the tape recorder where the heads are moved in a rotary path during transducing.

115	Flux scanning
	This subclass is indented under subclass 110.  Subject matter wherein the transducing area of a head is of substantially lesser width than that of the head and the transducing area is caused to move by applying opposing fluxes to different regions of the head.

116	Cathode ray
	This subclass is indented under subclass 110.  Subject matter wherein the transducer includes a means of generating a cathode ray and the cathode ray is used to produce, detect or control production or detection of magnetic flux. SEE OR SEARCH CLASS: 324,  Electricity: Measuring and Testing,   subclass 250 , for cathode ray magnetic field detectors.

117	Hand-held
	This subclass is indented under subclass 110.  Subject matter wherein the transducer is specifically adapted to be held in the hand of the user.

118	Erase
	This subclass is indented under subclass 110.  Subject matter wherein the transducer is specifically adapted for use in erasing a magnetic record. SEE OR SEARCH CLASS: 361,  Electricity: Electrical Systems and Devices,   subclasses 143+ , 159 and 267 for magnetic record erasers not associated with recorders or reproducers.

119.01	Gap spacer:
	This subclass is indented under subclass 110.  Subject matter including a detail of a nonmagnetic element located between poles of a head to define the transducing area.

119.02	For perpendicular recording head:
	This subclass is indented under subclass 119.01.  Subject matter wherein the transducer is configured to record data in a storage medium by orienting magnetic domains normal to the plane of the storage medium. (1) Note. Although this definition refers to the plane of a storage medium, it is understood that media may have a nonplanar macroscopic shape.

119.03	Laminated spacer:
	This subclass is indented under subclass 119.02.  Subject matter wherein the gap spacer is made up of a plurality of layers.

119.04	Configuration detail:
	This subclass is indented under subclass 119.02.  Subject matter including a detail of the structural form of the gap spacer.

119.05	For longitudinal thin film recording head:
	This subclass is indented under subclass 119.01.  Subject matter wherein the transducer comprises a plurality of thin layers and is configured to record data in a storage medium by orienting magnetic domains parallel to the plane of the storage medium. (1) Note. Although this definition refers to the plane of the storage medium, it is understood that media may have a nonplanar macroscopic shape.

119.06	Pancake type:
	This subclass is indented under subclass 119.05.  Subject matter wherein the layers are located in planes parallel to the plane of the storage medium.

119.07	Laminated spacer:
	This subclass is indented under subclass 119.05.  Subject matter wherein the gap spacer is made up of a plurality of layers. (1) Note. Metal in gap (MIG) can be found in this subclass.

119.08	With thermally conductive material:
	This subclass is indented under subclass 119.07.  Subject matter wherein one of the layers of the spacer is a material which transfers heat.

119.09	With diffusion barrier:
	This subclass is indented under subclass 119.07.  Subject matter wherein one of the layers of the spacer is a layer for preventing particles of spacer material from migrating out of the spacer area and into other layers of the transducer.

119.1	Three or more layers:
	This subclass is indented under subclass 119.07.  Subject matter wherein the number of layers is greater than two.

119.11	Configuration detail:
	This subclass is indented under subclass 119.05.  Subject matter includes a detail of the structural form of the gap spacer.

119.12	Nonuniform width transducing face:
	This subclass is indented under subclass 119.11.  Subject matter wherein the surface of the gap spacer facing the medium has a varying side-to-side measurement in the transverse direction of a recorded track.

119.13	Nonuniform width vertically:
	This subclass is indented under subclass 119.11.  Subject matter wherein a cross section of the gap spacer, in the transverse direction of a recorded track, varies along its extent normal to the storage medium.

121	Plural gaps:
	This subclass is indented under subclass 110.  Subject matter includes detailed structure of plural gap transducers.

122	Head surface structure
	This subclass is indented under subclass 110.  Subject matter wherein the shape, composition or other characteristic of that surface of the head which is proximate the record is specifically described.

123.01	Coil:
	This subclass is indented under subclass 110.  Subject matter including a detail of the position, size, inductance or other feature of the traces used to generate magnetic flux in the head. (1) Note. The term "trace" in the art is a singular wire or ribbon or strand of conductive material. Typically, multiple traces make up a coil. SEE OR SEARCH CLASS: 336,  Inductor Devices,   subclasses 5 through 234for inductor windings.

123.02	For perpendicular recording head:
	This subclass is indented under subclass 123.01.  Subject matter wherein a transducer is configured to record data in a storage medium by orienting magnetic domains normal to the plane of the storage medium. (1) Note. Although this definition refers to the plane of the storage medium, it is understood that the medium may have a nonplanar macroscopic shape.

123.03	Location:
	This subclass is indented under subclass 123.02.  Subject matter includes a detail of the position of the coil with respect to a specific part of the head structure.

123.04	On return pole:
	This subclass is indented under subclass 123.03.  Subject matter wherein the coil is positioned on or about a flux returning pole of the head structure.

123.05	On main/recording pole:
	This subclass is indented under subclass 123.03.  Subject matter wherein the coil is positioned on or about a flux-emanating pole of the head structure.

123.06	Configuration detail:
	This subclass is indented under subclass 123.02.  Subject matter including a detail of the structural form of the coil.

123.07	Nonuniform trace spacing:
	This subclass is indented under subclass 123.06.  Subject matter including a detail of the spacing between individual traces of the coil, where that spacing is not constant.

123.08	Trace cross section shape:
	This subclass is indented under subclass 123.06.  Subject matter including a detail of the cross-sectional configuration of an individual trace.

123.09	Insulation detail:
	This subclass is indented under subclass 123.02.  Subject matter including a detail of a nonmagnetic, nonelectrically conductive material used to encapsulate and isolate the coil.

123.1	Electrical connection detail:
	This subclass is indented under subclass 123.02.  Subject matter including a detail of a structure that provides a conductive path between the coil and an external device.

123.11	Plural separate coils:
	This subclass is indented under subclass 123.02.  Subject matter wherein the coil is made up of at least two distinct groups of turns of traces.

123.12	Shielding/protection:
	This subclass is indented under subclass 123.02.  Subject matter including a detail of a material or structure which protects or shields the coil, e.g., electrical shielding, corrosion protection. SEE OR SEARCH CLASS: 320,  Electricity: Battery or Capacitor Charging or Discharging,   subclasses 100 through 167for detail of magnetic shielding, head insulation, respectively, accompanied with a magnetoresistive (MR) type read head.

123.13	For thin film longitudinal recording head:
	This subclass is indented under subclass 123.01.  Subject matter wherein the transducer comprises a plurality of thin layers and is configured to record data in a storage medium by orienting magnetic domains parallel to the plane of the storage medium. (1) Note. Although this definition refers to the plane of the storage medium, it is understood that the medium may have a nonplanar macroscopic shape.

123.14	Pancake type:
	This subclass is indented under subclass 123.13.  Subject matter wherein the layers are located in planes parallel to the plane of the medium.

123.15	Plural coil layers:
	This subclass is indented under subclass 123.14.  Subject matter wherein the coil is made up of more than one layer, with each layer positioned in a plane parallel to the plane of the medium.

123.16	Insulation detail:
	This subclass is indented under subclass 123.14.  Subject matter including a detail of the nonmagnetic, nonelectrically conductive material used to encapsulate and isolate the coil.

123.17	Plural separate coils:
	This subclass is indented under subclass 123.13.  Subject matter wherein coil is made up of at least two distinct groups of turns of traces.

123.18	Single plane coil:
	This subclass is indented under subclass 123.13.  Subject matter wherein the coil is made up of plural connected conductive traces located in one plane perpendicular to the plane of the medium.

123.19	Configuration detail:
	This subclass is indented under subclass 123.18.  Subject matter including a detail of the structural form of the winding.

123.2	Trace cross section shape:
	This subclass is indented under subclass 123.19.  Subject matter including a detail of the cross-sectional configuration of an individual trace.

123.21	Trace spacing:
	This subclass is indented under subclass 123.19.  Subject matter including a detail of the spacing between individual traces of the winding.

123.22	Coil spacing from storage medium:
	This subclass is indented under subclass 123.19.  Subject matter including a detail of the spacing of the trace closest to the medium.

123.23	Coil spacing from plane of gap:
	This subclass is indented under subclass 123.19.  Subject matter includes a detail of the spacing from the plane of the coil to a plane of the gap, the spacing being measured in the direction of travel of the medium. (1) Note. The gap is the transducing gap that allows the flux to pass through during the writing/recording process.

123.24	Seed layer:
	This subclass is indented under subclass 123.18.  Subject matter wherein one or more additional layers are provided to promote disposition or growth of coil material.

123.25	Insulation detail:
	This subclass is indented under subclass 123.18.  Subject matter includes a detail of a nonmagnetic, nonelectrically conductive material used to encapsulate and isolate the coil.

123.26	Zero throat height detail:
	This subclass is indented under subclass 123.25.  Subject matter wherein the detail of the insulation pertains to the point at which the distance between the poles begins to increase.

123.27	Apex angle:
	This subclass is indented under subclass 123.25.  Subject matter includes a detail of the configuration of the nonmagnetic, nonelectrically conductive insulation that defines the slope of a pole adjacent a pole tip region. (1) Note. A pole tip region is the area closest to the storage medium.

123.28	Plural layers:
	This subclass is indented under subclass 123.25.  Subject matter wherein the nonmagnetic, nonelectrically conductive insulation is made up of more than one layer.

123.29	Diverse materials:
	This subclass is indented under subclass 123.28.  Subject matter wherein at least one of the plural layers is of a material different from that of the other layers.

123.3	Planarizing layer:
	This subclass is indented under subclass 123.28.  Subject matter wherein at least one of the plural insulation layers is provided to form a flat surface.

123.31	Below coil:
	This subclass is indented under subclass 123.28.  Subject matter wherein more than one of the plural insulation layers are positioned below the plane of the coil.

123.32	Above coil:
	This subclass is indented under subclass 123.28.  Subject matter wherein more than one of the plural insulation layers are positioned above the plane of the coil.

123.33	Between traces:
	This subclass is indented under subclass 123.28.  Subject matter wherein more than one of the plural insulation layers are positioned between individual conductive traces of the coil.

123.34	Between coil and medium:
	This subclass is indented under subclass 123.28.  Subject matter wherein more than one of the plural insulation layers are positioned between the medium and the trace closest to the medium.

123.35	Plural diverse layers:
	This subclass is indented under subclass 123.18.  Subject matter wherein each trace of the coil is made up of more than one layer, at least one of which is of a material different from that of the other layers.

123.36	Electrical connection detail:
	This subclass is indented under subclass 123.18.  Subject matter including a specific feature that provides a conductive path between the coil and an external device.

123.37	Shielding/protection:
	This subclass is indented under subclass 123.18.  Subject matter including a detail of a material or structure that protects or shields the coil, e.g., electrical shielding, corrosive protection. SEE OR SEARCH CLASS: 320,  Electricity: Battery or Capacitor Charging or Discharging,   subclasses 100 through 167for detail of magnetic shielding, head insulation, respectively, accompanied with a magnetoresistive (MR) type read head.

123.38	Plural plane coil:
	This subclass is indented under subclass 123.13.  Subject matter wherein the coil is made up of plural connected conductive traces located in more than one plane perpendicular to the plane of the storage medium.

123.39	Intercoil layer electrical connection detail:
	This subclass is indented under subclass 123.38.  Subject matter including a specific feature that provides a conductive path between two or more coil segments.

123.4	Configuration detail:
	This subclass is indented under subclass 123.38.  Subject matter including a detail of the structural form of a coil layer.

123.41	Trace cross section shape:
	This subclass is indented under subclass 123.4.  Subject matter including a detail of the cross-sectional configuration of an individual trace.

123.42	Trace spacing:
	This subclass is indented under subclass 123.4.  Subject matter including a detail of the spacing between individual traces of the coil.

123.43	Coil spacing from storage medium:
	This subclass is indented under subclass 123.4.  Subject matter including a detail of the spacing of the trace closest to the medium.

123.44	Coil spacing from plane of gap:
	This subclass is indented under subclass 123.4.  Subject matter including a detail of the spacing from the plane of the coil to the plane of the gap, the spacing being measured in the direction of travel of the medium.

123.45	Seed layer:
	This subclass is indented under subclass 123.38.  Subject matter wherein one or more additional layers are provided to promote disposition or growth of coil material.

123.46	Insulation detail:
	This subclass is indented under subclass 123.38.  Subject matter including a detail of a nonmagnetic, nonelectrically conductive material used to encapsulate and isolate the coil.

123.47	Zero throat height detail:
	This subclass is indented under subclass 123.46.  Subject matter wherein the detail of the insulation pertains to the point at which the distance between the poles begins increase.

123.48	Apex angle:
	This subclass is indented under subclass 123.46.  Subject matter including a detail of the configuration of the nonmagnetic, nonelectrically conductive insulation that defines the slope of a core adjacent the pole tip region.

123.49	Plural layers:
	This subclass is indented under subclass 123.46.  Subject matter wherein the nonmagnetic, nonelectrically conductive insulation is made up of more than one layer.

123.5	Diverse materials:
	This subclass is indented under subclass 123.49.  Subject matter wherein at least one of the plural layers is of a material different from that of other layers.

123.51	Planarizing layer:
	This subclass is indented under subclass 123.49.  Subject matter wherein at least one of the plural layers is provided to form a flat surface.

123.52	Below coil:
	This subclass is indented under subclass 123.49.  Subject matter wherein more than one of the layers are positioned below the plane of the lowermost coil segment.

123.53	Above coil:
	This subclass is indented under subclass 123.49.  Subject matter wherein more than one of the layers are positioned above the plane of the uppermost coil segment.

123.54	Between traces:
	This subclass is indented under subclass 123.49.  Subject matter wherein more than one of the plural layers are positioned between the adjacent segments of the coil.

123.55	Between coil and medium:
	This subclass is indented under subclass 123.49.  Subject matter wherein more than one of the plural layers are positioned between the medium and the traces closest the medium.

123.56	Plural diverse layers:
	This subclass is indented under subclass 123.38.  Subject matter wherein each trace of the coil is made up of more than one layer, at least one of which is of a material different from that of the other layers.