US PATENT SUBCLASS 91 / 320
.~.~.~ Port in piston between opposed working faces

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}
319  DF  .~.~ Working member traverses pilot passage to control distributor motor {1}
320.~.~.~ Port in piston between opposed working faces

DEFINITION

Classification: 91/320

(under subclass 319) Apparatus in which the working member comprises a piston having opposed working faces and a passage on or in the piston between the opposed working faces, the distributor motor fluid being conveyed to or from the distributor motor working chamber by said passage.