US PATENT SUBCLASS 239 / 571
.~.~ Flow direction responsive valve

Current as of: June, 1999
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239 /   HD   FLUID SPRINKLING, SPRAYING, AND DIFFUSING

569  DF  INCLUDING VALVE MEANS IN FLOW LINE {11}
570  DF  .~ Line fluid operated {2}
571.~.~ Flow direction responsive valve

DEFINITION

Classification: 239/571

(under subclass 570) Apparatus in which the flow controlling means acts in response to the direction in which material flows.