PATENTS   
Patents > Guidance, Tools, and Manuals >> Classification >>> Class Definition
    Class Numbers & Titles   | Class Numbers Only   | USPC Index   | International   | HELP  
You are viewing a Class definition.

 [Search a list of Patent Appplications for class 346]   CLASS 346,RECORDERS
Click here for a printable version of this file

SECTION I - CLASS DEFINITION

This is generic class for apparatus and corresponding processes for:

A. Making a record of the movements of machines or instruments whose movements are desired to be recorded and at least temporarily preserved.

B. Making a record of any phenomenon capable of being detected either quantitatively or qualitatively and recorded for at least temporary preservation:

The preceding in general require (a) the means to make the record, (b) the means to detect qualitatively or quantitatively the movement or other phenomenon, and (c) the means actuated in accordance with the movement or other phenomenon to cause the record making means to function.

C. The record making means and its immediate actuating means as a subcombination of (A) and (B).

D. Watchmen"s and workmen"s time-recorders and time stamps.

This class also includes compartmented boxes adapted to receiving checks, means being provided either for manual operation or for clock work to shift a part so that a check will be received in a selected compartment. See Subclass References to the Current Class, below, identified as other classes for record-making.

(1) Note. Organized apparatus significantly claimed combined with a recording means which records some quality or quantity related to such apparatus or its function, are for the most part classified in the class appropriate to the type of organized apparatus (see References to Other Classes, below.)

SECTION II - SUBCLASS REFERENCES TO THE CURRENT CLASS

SEE OR SEARCH THIS CLASS, SUBCLASS:

27,for compartmented boxes adapted to receiving checks, means being provided either for manual operation or for clock work to shift a part so that a check will be received in a selected compartment.

SECTION III - REFERENCES TO OTHER CLASSES

SEE OR SEARCH CLASS:

8Bleaching and Dyeing; Fluid Treatment and Chemical Modification of Textiles and Fibers,   particularly subclasses 445+ for dye printing. (other class for record making, see (1) Note, Class Definition).
33Geometrical Instruments,   subclasses 18.1+ for scribers, subclasses 304+ for borehole direction or inclination indicators with recorders, subclass 331 for other direction sensing and indicating devices with recorders.
70Locks,   subclasses 433+ for locks with recorders.
73Measuring and Testing,   for recording means broad or specific combined with significant measuring or testing structure, and see subclasses; subclasses 181+ , for recording ships" logs; subclass 312, for recording, float type, liquid level gauges; subclass 335.06, for a recording hygrometer; subclass 489, for recording means combined with a speed or acceleration responsive device; subclasses 570+, for apparatus having a recorder, for testing by vibrating the specimen; subclass 712, for recording fluid pressure gauges; subclass 862.27, for recording dynamometers.
84Music,   subclasses 461+ for devices for recording the movement of keys of a keyboard.
101Printing,   (other class for record making, see (1) Note, Class Definition).
116Signals and Indicators,   for nonrecording signals and indicators.
118Coating Apparatus,   will take organized systems including recording, only as relates to the transfer of a developed record-image by a Class 118 coating means. Means to develop a latent image by a Class 118 coating device will not exclude placement in Class 346. (Other class for record making, see (1) Note, Class Definition).
137Fluid Handling,   subclasses 551+ for fluid handling apparatus combined with a recorder. (other class for record making, see (1) Note, Class Definition).
177Weighing Scales,   subclasses 2+ for a recording weigher.
178Telegraphy,   for telegraph systems and receivers having a recorder, particularly; subclasses 4+ , for automatic printing systems; subclasses 18+, for writing systems; subclasses 23+, for nonautomatic printing systems; subclasses 36+, for printing receivers; subclasses 62, for chemical recording; subclasses 89+, for code recorders.
181Acoustics,   subclass 122 for mechanical seismographs.
194Check-Actuated Control Mechanisms,   for combinations of recorder with significant check-controlled apparatus.
205Electrolysis: Processes, Compositions Used Therein, and Methods of Preparing the Compositions,   subclasses 52+ for electrolytic marking. (Other class for record making, see (1) Note, Class Definition).
221Article Dispensing,   subclasses 2+ . (Other class for record making, see (1) Note, Class Definition).
222Dispensing,   subclasses 23+ particularly subclass 30 for dispensers combined with recorders.
232Deposit and Collection Receptacles,   subclass 18 for letter boxes having recorders.
235Registers,   subclasses 2+ for cash registers having a recorder; subclasses 4+, for cash recorders; subclasses 50, for recording voting machines; subclasses 58+, for calculators having means to record either or both the factor entered or the result.
236Automatic Temperature and Humidity Regulation,   for significant systems of this type combined with a recorder.
246Railway Switches and Signals,   subclass 107 , for block signal systems having recorders; subclass 123, for systems for recording the time at which a train passes a given point. subclass 185, for means for actuating either signals or controls upon a train in combination with means to record the signal or control information.
250Radiant Energy,   subclass 315.3 for invisible radiation xerography; and subclasses 580+ for photography using invisible radiation. (other class for record making, see (1) Note, Class Definition)
250Radiant Energy,   subclasses 250+ for the detection of invisible radiation or the testing of material by invisible radiation and the recording of the results of the detection or the test.
273Amusement Devices: Games,   subclasses 138.1+ for recording chance devices.
318Electricity: Motive Power Systems,   subclasses 567+ for program or pattern controlled electric motive power systems, even though making the record is also claimed.
324Electricity: Measuring and Testing,   appropriate subclasses for electrical testing systems having a recorder combined therewith where no significant recording structure is involved. This Class (346) should be searched for the combination of electrical testing systems and a significant recorder.
331Oscillators,   subclass 44 for electric oscillators wherein means are provided for calibrating the tuning position indicator or dial of the oscillator by marking the indicator or dial in accordance with the results of the comparison of the generated frequency with the known frequency settings of a source of standard frequencies.
352Optics: Motion Pictures,   for motion picture recording apparatus. (Other class for record making, see (1) Note, Class Definition).
356Optics: Measuring and Testing,   for devices which utilize visible light or test visible light to measure optical properties of light or substances, distance, velocity, direction, angles, areas or volumes and which may use a recorder to make a permanent record of the test. See subclasses 300+ of Class 356 for the line between Classes 346 and 356. (Other class for record making, see (1) Note, Class Definition).
358Facsimile and Static Presentation Processing,   subclasses 296 through 304for facsimile system sharing a recording apparatus.
367Communications, Electrical: Acoustic Wave Systems and Devices,   subclasses 14+ for electrical seismographs and appropriate subclasses for recording signaling systems.
369Dynamic Information Storage or Retrieval,   for making a record of information which requires dynamic reproduction to recover the stored information. (Other class for record making, see (1) Note, Class Definition).
374Thermal Measuring and Testing,   subclass 186 for a thermometer combined with a detailed recording arrangement.
378X-Ray or Gamma Ray Systems or Devices,   subclasses 4+ and 21+ for X-ray tomography; subclasses 28+ for X-ray xeroradiography; subclasses 167+ for photographic detector supports; and subclasses 189+ for nonphotographic detector supports. (Other class for record making, see (1) Note, Class Definition).
379Telephonic Communications,   subclasses 111 through 141,for recorders for counting or charging telephone calls or connections combined with telephone systems or equipment; subclasses 245-249, for telephone calling number recorders.
386Television Signal Processing for Dynamic Recording or Reproducing,   subclasses 1+ and 46+ for television camera combined with video apparatus for recording or reproducing processed television signal.
396Photography,   appropriate subclasses for a photographic camera or photographic fluid treating apparatus. (Other class for record making, see (1) Note, Class Definition)
399Electrophotography,   subclasses 9+ for diagnostics, subclasses 38+ for controls, subclasses 130+ for image formation, subclasses 168+ for charging, subclasses 177+ for exposure, subclasses 222+ for development, subclasses 297+ for transfer, subclasses 320+ for fixing, subclasses 343+ for cleaning, and subclasses 361+ for document handling. (Other class for record making, see (1) Note, Class Definition)
400Typewriting Machines,   (other class for record making, see (1) Note, Class Definition)
422Chemical Apparatus and Process Disinfecting, Deodorizing, Preserving, or Sterilizing,   subclasses 50+ for chemical analytical and analytical-control apparatus involving recording means.
428Stock Material or Miscellaneous Articles,   subclasses 411.1+ for a composite, nonstructural web or sheet characterized solely by the compositions of the layers, and which may be useful as carbon or transfer paper, and especially subclasses 488.1, 537.1, and subclass 914 (a cross-reference art collection) for a transfer sheet. (Other class for record making, see (1) Note, Class Definition).
430Radiation Imagery Chemistry: Process, Composition, or Product Thereof,   (other class for record making, see (1) Note, Class Definition)
434Education and Demonstration,   subclass 47 for aircraft trainers combined with recorders.
436Chemistry: Analytical and Immunological Testing,   subclasses 1+ for chemical analytical and analytical-control processes involving recording steps.
505Superconductor Technology: Apparatus, Material, Process,   subclasses 150+ for high temperature (Tc > 30 K) superconducting devices, and particularly subclasses 170+ for information storage or retrieval systems, or recording.
600Surgery,   subclasses 523+ , 544+, and 900 for recorders associated with medical diagnostic apparatus.

SUBCLASSES

[List of Patents for class 346 subclass 2]    2ANGLE MEASUREMENT RECORDER FOR OPTICAL INSTRUMENTS
 Recorders forming part of a sextant, theodolite or other optical angle measuring device to record the observed angle.

SEE OR SEARCH CLASS:

356Optics: Measuring and Testing,   subclasses 138+ for angle measuring devices.
  
[List of Patents for class 346 subclass 3]    3PERFORMANCE OF MULTIPLE FUNCTIONS OF STEAM AND GAS ENGINES
 Recorders which exhibit the performance of a steam, gasoline or other expansible gas engine in terms of multiple parts of the engine or of a part operative in synchronism with the engine, i.e., one function of the engine (e.g., spark) should be plotted against another function of the engine (e.g., shaft rotation).

SEE OR SEARCH THIS CLASS, SUBCLASS:

45+,for other plural function recorders.

SEE OR SEARCH CLASS:

73Measuring and Testing,   subclass 115 for apparatus for testing engine performance or efficiency having means to record.
  
[List of Patents for class 346 subclass 4]    4Pressure responsive element
 This subclass is indented under subclass 3.  Recorders of the type specified in ... in which one element of the recorder is responsive to pressure existing within the engine cylinder.
(1) Note. Many of the indicators in this subclass use a long traveling paper web, upon which a time graph is drawn as paper is reeled past recording stylus.

SEE OR SEARCH THIS CLASS, SUBCLASS:

72,for recorders having a marker responsive to the expansion of a chamber.

SEE OR SEARCH CLASS:

73Measuring and Testing,   subclasses 700+ for fluid pressure gauges, particularly subclass 712 for recording type.
  
[List of Patents for class 346 subclass 5]    5Drum recorder
 This subclass is indented under subclass 4.  Recorders of the type specified in ... in which the record is made on a rotatable or oscillatable cylinder about which is wrapped a web sufficiently long to be wrapped but once therearound.

SEE OR SEARCH THIS CLASS, SUBCLASS:

138,and see the notes thereto for other recorders having drum type receivers.
  
[List of Patents for class 346 subclass 6]    6Bourdon tube marker element
 This subclass is indented under subclass 5.  Recorders of the type specified in ... in which a Bourdon tube is utilized to drive the marker element of the recorder.

SEE OR SEARCH CLASS:

73Measuring and Testing,   subclasses 741+ for Bourdon fluid pressure gauges.
92Expansible Chamber Devices,   appropriate subclasses for an expansible chamber device, per se.
  
[List of Patents for class 346 subclass 7]    7RECORD TRACER MOVEMENT RESPONSIVE TO INERTIA OR MASS INCLINATION
 Recorders having a record tracer portion operative upon a record receiver, said tracer portion being responsive to the motion of a tine of a tuning fork, or to the change in inclination of a body carrying a pendulous mass or to the displacement of a mass due to shocks or accelerations.

SEE OR SEARCH CLASS:

33Geometrical Instruments,   subclasses 308+ for pendulum directed recorders utilized in indicating borehole inclination and subclass 331 for direction sensing and indicating devices utilizing a recorder.
73Measuring and Testing,   subclasses 570+ for a test of vibration, or involving vibration of the test specimen; subclass 489 for an accelerometer with recording means; and subclasses 514+ for an accelerometer, per se.
84Music,   subclass 457 for tuning forks.
181Acoustics,   subclass 122 for mechanical seismographs.
324Electricity: Measuring and Testing,   subclass 162 for electrical accelerometers.
367Communications, Electrical: Acoustic Wave Systems and Devices,   subclasses 14+ for electrical seismographs.
  
[List of Patents for class 346 subclass 8]    8COURSE
 Recorders responsive to the direction assumed by a translating member to record either the direction assumed by that member or the rectangular components of direction assumed by that member. These recorders are usually mounted on a transporting member and are responsive to extent of motion of that member as well as to direction assumed by that member and the recorder may be associated with sundry other devices such as compasses, signals and time stamps. Included are devices that record deviation (i.e., left or right) from a set course, rudder position, steering wheel position, etc.

SEE OR SEARCH CLASS:

33Geometrical Instruments,   subclasses 775+ for means for measuring distance by means of a rolling contact.
40Card, Picture, or Sign Exhibiting,   subclasses 482+ for means for automatically moving a sign or map in accordance with the rotation of an axle.
73Measuring and Testing,   subclasses 178+ for navigating instruments particularly 181+ for recording ships" logs.
434Education and Demonstration,   subclass 47 for aircraft trainers combined with recorders or for such recorders, per se, when particularly adapted for making a record of the operation of such trainers.
  
[List of Patents for class 346 subclass 9]    9WEIGHT RECORDERS, BY PRINTING OR PERFORATING
 Recorders of the printing or perforating type having a part positioned in response to the position of a weighing member.

SEE OR SEARCH THIS CLASS, SUBCLASS:

40,for recorders operated by the weight of an individual or object thereon or passing thereover.
78+,and see the notes thereto for other print, dotting or punching markers.

SEE OR SEARCH CLASS:

177Weighing Scales,   subclasses 2+ for a recording weigher.
  
[List of Patents for class 346 subclass 10]    10Recording directly from weight positioned member
 This subclass is indented under subclass 9.  Recorders of the type in which the part positioned in response to the position of the weighing member is geared to the load bearing member and is a part of the recording means.
  
[List of Patents for class 346 subclass 11]    11Weight positioned member and independently movable record controlling followup element
 This subclass is indented under subclass 9.  Recorders of the type in which a recorder controlling element is movable independently of the weight responsive member and in which the weight responsive member exercises a control over the recorder control element or the recording mechanism associated therewith to cause proportional motion.

SEE OR SEARCH THIS CLASS, SUBCLASS:

9,for recorder elements which are merely positioned manually opposite a weight responsive indicator and in which no control is exercised by the indicator, or parts movable therewith.
31,for recorders with follow ups.
  
[List of Patents for class 346 subclass 12]    12Coaxial member and element
 This subclass is indented under subclass 11.  Recorders of the type in which the recorder controlling element moves about the same axis as the weight responsive member or co-linearly therewith.
  
[List of Patents for class 346 subclass 13]    13COMBINED WITH NON-RECORDING INTEGRATOR
 Recorders combined with means, other than the necessary elements to make a record, to integrate two or more quantities, the result of the integration being indicated but not recorded.

SEE OR SEARCH CLASS:

235Registers,   for integrators, per se.
  
[List of Patents for class 346 subclass 14]    14COMBINED WITH NON-RECORDING REGISTER
 Recorders combined with means, other than the necessary elements to make a record, to register the number of occurrences of a phenomenon. Included herein are combinations of recorders with electric meters and the like.

SEE OR SEARCH CLASS:

235Registers,   subclasses 2+ for combined cash registers and recorders, subclasses 4+ for cash recorders subclass 50 for recording voting machines and subclasses 58+ for calculators having means to record either or both the factors entered or the result, and other appropriate subclasses for nonrecording registers.
  
[List of Patents for class 346 subclass 15]    15Fare register
 Marking recorders combined with fare or passenger registers.

SEE OR SEARCH THIS CLASS, SUBCLASS:

97,for fare or passenger register character recording by dotting, printing or punching.

SEE OR SEARCH CLASS:

235Registers,   subclass 33 for fare registers, per se.
  
[List of Patents for class 346 subclass 16]    16And indicator or alarm
 This subclass is indented under subclass 15.  Recorders of the type combined with a nonrecording indicator or alarm mechanism.

SEE OR SEARCH THIS CLASS, SUBCLASS:

17,for nonrecording indicator or alarm in other combinations.

SEE OR SEARCH CLASS:

116Signals and Indicators,   for pertinent subclass (es) as determined by schedule rewiew.
340Communications: Electrical,   appropriate subclasses for miscellaneous electrical signaling systems and signals.
  
[List of Patents for class 346 subclass 17]    17COMBINED WITH NON-RECORDING INDICATOR OR ALARM
 This subclass is indented under subclass 16.  Recorders combined with a nonrecording indicator or alarm not already provided for in ... .

SEE OR SEARCH THIS CLASS, SUBCLASS:

16,for nonrecording indicator or alarm combined with a nonrecording fare register.

SEE OR SEARCH CLASS:

116Signals and Indicators,   for pertinent subclass (es) as determined by schedule rewiew
340Communications: Electrical,   appropriate subclasses for miscellaneous electric signaling systems or signals.
  
[List of Patents for class 346 subclass 18]    18Speed indicator or alarm
 This subclass is indented under subclass 17.  Recorders of the type in which the nonrecording indicator or alarm is speed responsive.

SEE OR SEARCH THIS CLASS, SUBCLASS:

150.1,for centrifugal governor responsive markers.

SEE OR SEARCH CLASS:

73Measuring and Testing,   subclass 489 for recorders with a speed or acceleration indicator. See (3) Note in the class definition of Class 346 for the line with Class 73.
74Machine Element or Mechanism,   subclass 12 for means to take off power from a main power line to operate speedometers.
116Signals and Indicators,   subclasses 37+ , 57, 62.1+, and 74 for signals and alarms that are speed actuated.
324Electricity: Measuring and Testing,   subclasses 160+ for electrical speed measuring and indicating.
340Communications: Electrical,   subclasses 670+ for electric signaling or alarm systems automatically responsive to speed.
  
[List of Patents for class 346 subclass 19]    19COMBINED WITH AUTOGRAPHIC APPARATUS
 Recorders combined with other means whereby a second record may be made on a record receiver by means of a freely movable implement, which implement is a unit normally independent of the recorder and which implement is solely under control of an operator, except that the recorder is provided with an opening over the record receiver to delimit the area in which said second record may be made.

SEE OR SEARCH THIS CLASS, SUBCLASS:

26,for autograph as sole record.

SEE OR SEARCH CLASS:

281Books, Strips, and Leaves,   for pertinent subclass(es) as determined by schedule rewiew
462Books, Strips, and Leaves, for Manifolding,   for pertinent subclass(es) as determined by schedule review.
  
[List of Patents for class 346 subclass 20]    20COMBINED WITH CLOCK
 Recorders combined with clock mechanism in which there are time scale and indicator means.

SEE OR SEARCH THIS CLASS, SUBCLASS:

26,for time driven recorder elements with autograph as sole record.
30,for time driven recorder elements also driven by a second factor.
53,for time recording, where a second function is also recorded on the same record receiver by a second marker, the markers being under control of an element normally unconnected with the apparatus (e.g., a key), a marker being of the dotting, printing or punching type.
55,for time driven record receiving element, where two or more functions are recorded thereon by markers under control of an element normally unconnected with the apparatus (e.g., a key), a marker being of the dotting, printing or punching type.
57,for time driven record receiving element, where two or more functions are recorded thereon, where an element normally disconnected from the apparatus is used to make a printing, dotting or punching mark on the receiving element.
58,for time recording, where second function is recorded by second marker on same receiver, where an element normally disconnected from the apparatus is used to make a dotting, printing or punching mark on the receiver.
59+,for time recording, where a second function is recorded on the same receiver, dotting, printing, or punching markers being used.
64,for time driven record receiver, where a single marker records two or more functions, the marker being controlled by an element normally unconnected with the apparatus.
80+,for time recording utilizing a dotting, printing or punching marker.
86,for time controlled mechanism, used to shift a holder for a separate record receiver card so that when the card is inserted in the machine at different times, superimposed dotting, printing or punching records are avoided.
114+,for time driven record receiving web, there being a "writer" type marker.
115,for time driven "writer" type marker, with time driven record receiving web.
121+,for time driven record receiving disc, there being a "writer" type marker.
127+,for time driven record receiving drum, there being a "writer" type marker.
142,for hand time stamps.
  
[List of Patents for class 346 subclass 21]    21COMBINED WITH RECORD DELETING MEANS
 Recorders provided with means to delete the record.

SEE OR SEARCH CLASS:

510Cleaning Compositions for Solid Surfaces, Auxiliary Compositions Therefor, or Processes of Preparing the Compositions,   subclass 174 for compositions for removing ink or writing fluid markings, such as ink eradicators.
  
[List of Patents for class 346 subclass 22]    22COMBINED WITH RECORD RECEIVER DEPOSIT RECEPTACLE OR RECORD RECEIVER THROUGH CHUTE
 Recorders provided either with deposit receptacles to receive individual units of a record or units on which records are made or with a chute through which the record receiver passes from mouth to exit opening, a record being made in the interim.

SEE OR SEARCH THIS CLASS, SUBCLASS:

27,for selective compartments to receive checks.
48,for plural record receivers in a magazine, with mechanism for moving one to a position to receive a record.

SEE OR SEARCH CLASS:

232Deposit and Collection Receptacles,   for pertinent subclass (es) as determined by schedule rewiew.
  
[List of Patents for class 346 subclass 23]    23COMBINED WITH FIDUCIAL LINE MAKING
 Recorders combined with means to make a reference line on the record receiver.
  
[List of Patents for class 346 subclass 24]    24COMBINED WITH RECORD RECEIVER SEVERER
 Recorders combined with means to sever or facilitate severing of the completed record from the supply of record receiving material.

SEE OR SEARCH CLASS:

83Cutting,   appropriate subclasses for the severing subcombination.
225Severing by Tearing or Breaking,   appropriate subclasses for the record tearing subcombination.
242Winding, Tensioning, or Guiding,   subclasses 522+ for cutting elongated material and subsequent convolute winding.
  
[List of Patents for class 346 subclass 25]    25COMBINED WITH OTHER NON-RECORDING DEVICES
 Recorders combined with nonrecording devices other than those provided for in preceding subclasses.

SEE OR SEARCH THIS CLASS, SUBCLASS:

33+,for recorders combined with means the functioning of which is to be recorded.
  
[List of Patents for class 346 subclass 26]    26AUTOGRAPH AS SOLE RECORD, TIME DRIVEN ELEMENT
 Recorders wherein there is a record receiver utilizing a time driven element to receive a mark, or wherein a time driven element is utilized to control the application of a mark to the record receiver, with which receiver is adapted to cooperate an implement, normally independent of the recorder, and which implement is solely under control of an operator except that the recorder is provided with an opening over the record receiver to delimit the area in which a record may be made.

SEE OR SEARCH THIS CLASS, SUBCLASS:

19,for autograph recording combined with other recording.
20,and see the notes thereto for timing subclasses in this class.

SEE OR SEARCH CLASS:

281Books, Strips, and Leaves,   for pertinent subclass (es) as determined by schedule rewiew
462Books, Strips, and Leaves, for Manifolding,   for pertinent subclass(es) as determined by schedule review.
  
[List of Patents for class 346 subclass 27]    27CHECK RECEIVERS, SELECTIVE COMPARTMENT
 Compartmented boxes adapted to receive checks, means being provided either by manual operation or by clockwork to shift a part so that checks will be received in successive compartments.
(1) Note. For the most part there is a recorder as part of the combination.

SEE OR SEARCH THIS CLASS, SUBCLASS:

22,for record receiver deposit receptacles.
48,for record receiver magazine and means for moving a receiver to a position to receive a mark.
  
[List of Patents for class 346 subclass 28]    28EXTENT OF WEB ADVANCE AS SOLE MEASURE OF FUNCTION
 Recorders wherein the sole means for obtaining the record of a function is determined by the length of a web advanced at a rate proportioned to the function. The web may have preprinted indicia thereon.

SEE OR SEARCH THIS CLASS, SUBCLASS:

136,and see the notes thereto for other web subclasses.
  
[List of Patents for class 346 subclass 29]    29MULTIFACTOR-DRIVEN RECORDER ELEMENT
 Recorders wherein one of the recording elements is responsive, concurrently to two or more functions, such as amperes and volts or kva, or kw. or fuel consumption and quantity of steam produced, or two pressures.

SEE OR SEARCH THIS CLASS, SUBCLASS:

3+,for recording plural functions of steam and gas engines.
45+,for making records of two or more functions, which records may be distinguished from each other, particularly subclasses 62+, where a single marker and single record receiver are involved.
  
[List of Patents for class 346 subclass 30]    30Time factor
 This subclass is indented under subclass 29.  Recorders of the type wherein one of the functions is time. There may be more than two functions controlling the motion of the recording element.

SEE OR SEARCH THIS CLASS, SUBCLASS:

20,and see the notes thereto for timing subclasses in this class.
  
[List of Patents for class 346 subclass 31]    31FOLLOW-UP
 Recorder mechanisms in which there is a function responsive element, a recorder controlling element, and a recorder element controlled thereby, said controlling element being movable by means independent of the means employed for controlling the function responsive element, and in which the controlling element assumes a position determined by the condition of the function responsive element.

SEE OR SEARCH THIS CLASS, SUBCLASS:

11,for weight responsive members with mechanism to control a movable recorder element to cause proportional motion.
32,for rebalancing systems.

SEE OR SEARCH CLASS:

74Machine Element or Mechanism,   subclass 388 for follow-up gearing.
91Motors: Expansible Chamber Type,   subclasses 358+ for expansible chamber motors having working member position feedback control.
114Ships,   subclass 144 for follow-up ship steering.
236Automatic Temperature and Humidity Regulation,   subclasses 74+ for regulating systems having electrical follow-ups.
244Aeronautics and Astronautics,   subclasses 76+ for follow-up aircraft steering.
303Fluid-Pressure and Analogous Brake System,   subclass 54 for follow-up fluid pressure brake valves.
318Electricity: Motive Power Systems,   subclasses 560+ for electric motor servomechanisms.
340Communications: Electrical,   subclass 870.43 for telemetric systems having follow up.
  
[List of Patents for class 346 subclass 32]    32REBALANCING SYSTEMS
 Recorder mechanism embodying a function responsive element which moves in either of two opposite directions from a normal or balanced position in accordance with the change in the function and which controls the movement of a mechanism to restore or rebalance the element to its normal position, the mechanism in its restoring operation effecting the shifting of a recorder element.

SEE OR SEARCH THIS CLASS, SUBCLASS:

31,for follow-up systems and see the notes thereto.
  
[List of Patents for class 346 subclass 33]    33COMBINED WITH EXTERNAL RECORDER OPERATING MEANS
 Recorders combined with the means the functioning of which is recorded.
(1) Note. Where a functioning means is claimed broadly as operating a specific recorder, the patents are classified in an appropriate subclass in this class and which subclass includes the structure of the specific recorder.
(2) Note. Where both the functioning means and the recorder are claimed broadly or where modifications of the functioning means are claimed to adapt it to its recording operation or where specific interconnecting structure between the functioning means and the recorder are claimed, the patents are classified in this and in indented subclasses.
(3) Note. For the most part, art devices significantly claimed combined with means to record one or more aspects of the operation thereof, are classified with the art device, see the notes to the class definition.

SEE OR SEARCH THIS CLASS, SUBCLASS:

25,and preceding subclasses for recorders combined with nonrecording devices.
72,for float or expansible chamber operated recorders.
73,for centrifugal governor operated recorders.

SEE OR SEARCH CLASS:

73Measuring and Testing,   subclasses 152.02+ for a process or an apparatus for borehole formation logging wherein the logging is not a purely electrical or a purely magnetic test and subclass 152.62 for a combination of a recorder and an apparatus for testing a pump for use in a borehole test or a drilling test wherein the test is not a purely electrical or a purely magnetic test.
374Thermal Measuring and Testing,   subclass 186 for recording thermometers having significantly claimed measuring and recording features.