US PATENT SUBCLASS 91 / 48
.~ Plural separately controlled vents

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

47  DF  CONSTANTLY APPLIED MOTIVE FLUID WITH CONTROLLED VENTING {4}
48.~ Plural separately controlled vents

DEFINITION

Classification: 91/48

(under subclass 47) Apparatus in which the working chamber is provided with a plurality of outlets or vent passages there being control means for each of the vent passages which act independently or at different times or under different conditions.