US PATENT SUBCLASS 91 / 312
.~.~.~ Distributor motor working member is valve seat for pilot valve

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

218  DF  CYCLICALLY OPERABLE {34}
281  DF  .~ Working member controlled motive fluid for distributor motor {12}
304  DF  .~.~ Pilot valve controlled distributor motor (461) {9}
312.~.~.~ Distributor motor working member is valve seat for pilot valve

DEFINITION

Classification: 91/312

(under subclass 304) Apparatus in which a distributor motor motive fluid supply or exhaust port is provided in the distributor motor working member and said port is controlled by relative movement between said working member and the pilot valve.