| 73 / | HD | MEASURING AND TESTING |
| 861 | DF | VOLUME OR RATE OF FLOW {23} |
| 232 | DF | .~ Expansible chamber {6} |
| 253 | DF | .~.~ Rotary piston or cylinder {5} |
| 255 | DF | .~.~.~ With orbital movement {2} |
| 257 | | .~.~.~.~ Single stationary abutment {1} |
| 258 | DF | .~.~.~.~.~> Nutating piston |