US PATENT SUBCLASS 417 / 532
.~.~.~ Unitary element movable about an axis

Current as of: June, 1999
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417 /   HD   PUMPS

437  DF  EXPANSIBLE CHAMBER TYPE {40}
521  DF  .~ Plural pumping chambers {7}
531  DF  .~.~ Unitary or interconnected elements form inlet or discharge distributors for plural chambers {1}
532.~.~.~ Unitary element movable about an axis

DEFINITION

Classification: 417/532

(under subclass 531) Apparatus in which the means for

controlling pump fluid flow into or out of said two or more chambers comprises a single valve member which moves as a unit about an axis.