US PATENT SUBCLASS 251 / 242
.~.~.~ 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}
242.~.~.~ Spring {2}
243  DF  .~.~.~.~> Co-acts with lever
244  DF  .~.~.~.~> Co-axial with valve stem {2}

DEFINITION

Classification: 251/242

(under subclass 236) Apparatus wherein the bias is provided by spring means.