US PATENT SUBCLASS 417 / 419
.~.~.~ Relatively movable pumping members

Current as of: June, 1999
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417 /   HD   PUMPS

321  DF  MOTOR DRIVEN {32}
410.1  DF  .~ Electric or magnetic motor {10}
415  DF  .~.~ Reciprocating rigid pumping member {2}
419.~.~.~ Relatively movable pumping members

DEFINITION

Classification: 417/419

(under subclass 415) Apparatus in which the pump comprises a plurality of rigid pumping members which move or are capable of moving relative to one another incident to the operation of the pump.