US PATENT SUBCLASS 251 / 238
.~.~.~.~ Spring

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  DF  .~.~ Biased {3}
237  DF  .~.~.~ Sliding contact {1}
238.~.~.~.~ Spring {1}
239  DF  .~.~.~.~.~> Spring co-axial with valve arm {2}

DEFINITION

Classification: 251/238

(under subclass 237) Valves wherein the valve is spring biased.