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| Class Numbers & Titles | Class Numbers Only | USPC Index | International | HELP |
| You are viewing a USPC Schedule. |
Class 74 | MACHINE ELEMENT OR MECHANISM |
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| 1R | MISCELLANEOUS |
| 1.5 | ESCAPEMENTS |
| 2 | AUTOMATIC OPERATION OR CONTROL (E.G., TRIPS) |
| 3 | Speed controlled |
| 3.5 | Retarded |
| 4 | Hit and miss |
| 5R | GYROSCOPES |
| 5.1 | With caging or parking means |
| 5.2 | With gimbal lock preventing means |
| 5.22 | Combined |
| 5.34 | Multiple gyroscopes |
| 5.4 | Gyroscope control |
| 5.41 | Erecting |
| 5.42 | By plural diverse forces |
| 5.43 | By jet |
| 5.44 | By weight |
| 5.45 | By friction |
| 5.46 | By magnetic field |
| 5.47 | By motor torque |
| 5.5 | Damping |
| 5.6R | With pick off |
| 5.7 | With rotor drive |
| 5.8 | Vertical gyroscopes |
| 5.9 | Horizontal gyroscopes |
| 5F | Flexure hinges for gyros |
| 5.95 | Flywheel structure |
| 6 | ENGINE STARTERS |
| 10R | SHAFT OPERATORS (RADIO TUNER TYPE) |
| 10.1 | Preselected position |
| 10.15 | Step by step |
| 10.2 | Rotatable stop and projectable abutment |
| 10.22 | Digital dial type |
| 10.27 | Plural operator |
| 10.41 | With detent or clicker |
| 10.45 | Plural shafts |
| 10.5 | Plural speed |
| 10.6 | Cam and follower |
| 10.7 | Tensioned flexible operator |
| 10.8 | Gear drive |
| 10.9 | Lever and linkage drive |
| 10A | Remote control |
| 813R | ROTARY MEMBER OR SHAFT INDEXING, E.G., TOOL OR WORK TURRET |
| 814 | With safety device or drive disconnect |
| 815 | With locating point adjusting |
| 816 | Preselected indexed position |
| 825 | Plural operators or input drives |
| 826 | With means to axially shift shaft |
| 827 | Single revolution input effects desired fractional output |
| 813C | Control means |
| 813L | Locking means |
| 11 | POWER TAKE-OFF |
| 12 | Speedometer |
| 13 | Wheel take-off |
| 15.2 | Plural take-off shafts |
| 15.4 | With independent change speed gearing |
| 15.6 | From shaft extension |
| 15.63 | Prime mover shaft, e.g., crank shaft |
| 15.66 | Change speed transmission shaft |
| 15.69 | Vehicle propeller shaft |
| 15.8 | Intermediate ends of power transmitting line |
| 16 | POWER TABLES AND STANDS |
| 17 | WASHER AND WRINGER |
| 17.5 | FULL STROKE MECHANISM |
| 17.8 | MOTION TRANSFER THROUGH IMPERFORATE FLEXIBLE SEAL |
| 18 | FLEXIBLE SEALING DIAPHRAGM ATTACHED TO MOVING ROD AND TO CASING |