US PATENT SUBCLASS 417 / 553
.~.~.~ Annular

Current as of: June, 1999
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417 /   HD   PUMPS

437  DF  EXPANSIBLE CHAMBER TYPE {40}
545  DF  .~ Valved piston {7}
552  DF  .~.~ Reciprocating {2}
553.~.~.~ Annular

DEFINITION

Classification: 417/553

(under subclass 552) Apparatus in which the valve comprises a ring like member.