US PATENT SUBCLASS 417 / 492
.~.~.~ Control by movement of pumping member about axis

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}
491  DF  .~.~ Common pumping member controls inlet or discharge for plural chambers {1}
492.~.~.~ Control by movement of pumping member about axis

DEFINITION

Classification: 417/492

(under subclass 491) Apparatus in which the pumping member rotates about its longitudinal axis to effect the covering and uncovering of said port.