US PATENT SUBCLASS 91 / 522
.~.~ With means to independently actuate valve means

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}
521  DF  .~ Separate valve means actuatable by a common nonmanual actuator or separately actuatable means with common manual actuator {3}
522.~.~ With means to independently actuate valve means

DEFINITION

Classification: 91/522

With means to independently actuate valve means:

(under subclass 521) Apparatus wherein, in addition to the single actuating means, included is a means permitting independent operation of the separate valve means.