| 73 / | HD | MEASURING AND TESTING |
| 488 | DF | SPEED, VELOCITY, OR ACCELERATION {29} |
| 514.01 | DF | .~ Acceleration determination utilizing inertial element {8} |
| 514.16 | DF | .~.~ Specific type of electric sensor or specific type of magnetic sensor {9} |
| 514.17 | DF | .~.~.~ Rebalance {4} |
| 514.21 | DF | .~.~.~.~ Pendulum or beam {2} |
| 514.23 | ![]() | .~.~.~.~.~ Including a flexure support |