| 73 / | HD | MEASURING AND TESTING |
| 66 | DF | ROTOR UNBALANCE {7} |
| 460 | DF | .~ Dynamic (spinning) {4} |
| 471 | DF | .~.~ With vibratable mount feature {3} |
| 475 | DF | .~.~.~ Horizontal rotational axis {2} |
| 476 | | .~.~.~.~ Horizontal plane of vibration {1} |
| 477 | DF | .~.~.~.~.~> Both ends free {1} |