| 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 |  | .~.~.~ Rebalance {4} |
| 514.18 | DF | .~.~.~.~> Electrostatic restoring means |
| 514.19 | DF | .~.~.~.~> Radiant energy sensor (e.g., optical, charged, or radioactive particle) |
| 514.21 | DF | .~.~.~.~> Pendulum or beam {2} |
| 514.24 | DF | .~.~.~.~> Including an elastic support for an inertial element (e.g., spring) |