US PATENT SUBCLASS 417 / 564
.~.~.~ Annular-type distributors

Current as of: June, 1999
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417 /   HD   PUMPS

437  DF  EXPANSIBLE CHAMBER TYPE {40}
559  DF  .~ Having pumping chamber pressure responsive distributor {8}
563  DF  .~.~ Similar inlet and discharge distributors of different size or material {1}
564.~.~.~ Annular-type distributors

DEFINITION

Classification: 417/564

(under subclass 563) Apparatus in which said valves consist of ring-shaped members.