US PATENT SUBCLASS 220 / 239
.~.~ Fluid pressure

Current as of: June, 1999
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220 /   HD   RECEPTACLES

200  DF  CLOSURES {45}
233  DF  .~ Externally adjustable plug or gasket {2}
239.~.~ Fluid pressure

DEFINITION

Classification: 220/239

(under subclass 233) Device wherein the gasket or packing is manipulated or adjusted by fluid pressure.