US PATENT SUBCLASS 91 / 424
.~ Two hand control

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

418  DF  WITH MOTIVE FLUID VALVE {32}
424.~ Two hand control {1}
425  DF  .~.~> With motor-controlled holding means for valve

DEFINITION

Classification: 91/424

(under subclass 418) Apparatus in which operation of the valve means requires the use of both hands of a human operator.