US PATENT SUBCLASS 251 / 236
.~.~ Biased

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

213  DF  MECHANICAL MOVEMENT ACTUATOR {10}
231  DF  .~ Lever {5}
236.~.~ Biased {3}
237  DF  .~.~.~> Sliding contact {1}
242  DF  .~.~.~> Spring {2}
247  DF  .~.~.~> Weight

DEFINITION

Classification: 251/236

(under subclass 231) Apparatus having the valve biased either to open or to closed position.