US PATENT SUBCLASS 417 / 530
.~.~.~ Including nonvalved piston

Current as of: June, 1999
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417 /   HD   PUMPS

437  DF  EXPANSIBLE CHAMBER TYPE {40}
521  DF  .~ Plural pumping chambers {7}
523  DF  .~.~ Including valved piston {5}
530.~.~.~ Including nonvalved piston

DEFINITION

Classification: 417/530

(under subclass 523) Apparatus in which the piston of at least one of the chambers is imperforate.