US PATENT SUBCLASS 239 / 540
.~.~ Disc type

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

537  DF  TERMINAL MEMBER AND VALVE PART MOVE AS UNIT {2}
538  DF  .~ Rotatable unit {2}
540.~.~ Disc type

DEFINITION

Classification: 239/540

(under subclass 538) Apparatus in which the valve part takes the form of a disc which rotates against a flat surface to block or permit flow.