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 |