| 73 / | HD | MEASURING AND TESTING |
| 488 | DF | SPEED, VELOCITY, OR ACCELERATION {29} |
| 514.01 | DF | .~ Acceleration determination utilizing inertial element {8} |
| 514.05 | | .~.~ Fluid or fluent material {4} |
| 514.06 | DF | .~.~.~> Fluid or fluent material support of an inertial element {2} |
| 514.09 | DF | .~.~.~> Fluid or fluent inertial mass |
| 514.11 | DF | .~.~.~> Detection by fluid pressure |
| 514.12 | DF | .~.~.~> Fluid or fluent material dampening of an inertial element {1} |