US PATENT SUBCLASS 251 / 313
.~ Biased

Current as of: June, 1999
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251 /   HD   VALVES AND VALVE ACTUATION

304  DF  ROTARY VALVES {5}
313.~ Biased

DEFINITION

Classification: 251/313

(under subclass 304) Devices in which means are provided to bias the valve to open or closed position.