US PATENT SUBCLASS 417 / 389
.~.~.~.~ Plural collapsible walls

Current as of: June, 1999
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417 /   HD   PUMPS

321  DF  MOTOR DRIVEN {32}
375  DF  .~ Fluid motor {9}
379  DF  .~.~ With motive fluid generator {5}
383  DF  .~.~.~ Pulsator or fluid link {3}
389.~.~.~.~ Plural collapsible walls

DEFINITION

Classification: 417/389

(under subclass 383) Apparatus in which both the movable driving member and the fluid motor working member are fabricated of either (1) flexible material or (2) rigid members hinged or interfitted together so that the members are movable relative to each other; the flexing of the material or relative movement of the rigid members of the driven member serving to cause flexing of the material or relative movement of the rigid members of the fluid motor working members.