| 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} | 
| 514.22 | ![]()  | .~.~.~.~.~ Including a bearing support |