US PATENT SUBCLASS 91 / 535
.~ Relatively movable working members of unequal cross-sectional areas

Current as of: June, 1999
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91 /   HD   MOTORS: EXPANSIBLE CHAMBER TYPE

508  DF  PLURAL RELATIVELY MOVABLE OR RIGIDLY INTERCONNECTED WORKING MEMBERS {11}
535.~ Relatively movable working members of unequal cross-sectional areas

DEFINITION

Classification: 91/535

Relatively movable working members of unequal cross-sectional areas:

(under subclass 508) Apparatus wherein at least two of the working members are relatively movable and have cross-sectional areas which are unequal.