| 417 / | HD | PUMPS |
| 437 | DF | EXPANSIBLE CHAMBER TYPE {40} |
| 474 | DF | .~ Elongated flexible chamber wall progressively deformed {2} |
| 476 | DF | .~.~ Deformation by rolling or sliding engagement member {1} |
| 477.1 | DF | .~.~.~ Plural spaced engagement members or member portions {6} |
| 477.3 | DF | .~.~.~.~ Specific rollers or slides structure {5} |
| 477.4 | | .~.~.~.~.~ Helical slide |