73 / | HD | MEASURING AND TESTING |
488 | DF | SPEED, VELOCITY, OR ACCELERATION {29} |
504.02 | DF | .~ Angular rate using gyroscopic or Coriolis effect {4} |
504.08 | .~.~ Rotary gyroscope {2} | |
504.09 | DF | .~.~.~> Gimbal support |
504.11 | DF | .~.~.~> Flexible rotor or flexibly mounted rotor |