US PATENT SUBCLASS 417 / 494
.~.~.~ Having means to selectively effect control at different positions of pumping member stroke

Current as of: June, 1999
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417 /   HD   PUMPS

437  DF  EXPANSIBLE CHAMBER TYPE {40}
490  DF  .~ Pumping member position controlled port {8}
493  DF  .~.~ Including plural controlled inlet or outlet flow paths {2}
494.~.~.~ Having means to selectively effect control at different positions of pumping member stroke

DEFINITION

Classification: 417/494

(under subclass 493) Apparatus including means which may be selectively moved and held in different positions to effect control of said pumping member controlled port at different times in the pumping member stroke.