US PATENT SUBCLASS 137 / 384.6
.~.~ Biased valve

Current as of: June, 1999
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137 /   HD   FLUID HANDLING

383  DF  WITH LOCK OR SEAL {3}
384.2  DF  .~ Common lock and valve actuator {3}
384.6.~.~ Biased valve

DEFINITION

Classification: 137/384.6

(under subclass 384.2) Devices in which the valve head is biased to or from the open position.