418 / | HD | ROTARY EXPANSIBLE CHAMBER DEVICES |
54 | DF | WORKING MEMBER HAS PLANETARY OR PLANETATING MOVEMENT {6} |
58 | DF | .~ Plural working members or chambers {3} |
61.1 | .~.~ Circumferentially spaced working chambers {2} | |
61.2 | DF | .~.~.~> Rotor has one more lobe than cylinder (i.e., Wankel type) |
61.3 | DF | .~.~.~> Rotor has one less lobe than cylinder (i.e., Gerotor type) |