| 73 / | HD | MEASURING AND TESTING | 
| 488 | DF | SPEED, VELOCITY, OR ACCELERATION {29} | 
| 504.02 | DF | .~ Angular rate using gyroscopic or Coriolis effect {4} | 
| 504.05 | ![]()  | .~.~ Fluid or fluent inertial mass (e.g., electrons, ions, plasma) {2} | 
| 504.06 | DF | .~.~.~> Fluid jet | 
| 504.07 | DF | .~.~.~> Rotary |