91 / | HD | MOTORS: EXPANSIBLE CHAMBER TYPE |
508 | DF | PLURAL RELATIVELY MOVABLE OR RIGIDLY INTERCONNECTED WORKING MEMBERS {11} |
521 | DF | .~ Separate valve means actuatable by a common nonmanual actuator or separately actuatable means with common manual actuator {3} |
524 | .~.~ Successive actuation of separate valve means |