| 73 / | HD | MEASURING AND TESTING | 
| 488 | DF | SPEED, VELOCITY, OR ACCELERATION {29} | 
| 510 | DF | .~ Response to multiple sensing means or motion conditions {1} | 
| 511 | ![]()  | .~.~ Response to both velocity and acceleration {1} | 
| 512 | DF | .~.~.~> Centrifugal-type velocity sensor and separate inertial means |