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