US PATENT SUBCLASS 251 / 278
.~.~.~ Spring

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

213  DF  MECHANICAL MOVEMENT ACTUATOR {10}
264  DF  .~ Screw {5}
277  DF  .~.~ Biased {1}
278.~.~.~ Spring

DEFINITION

Classification: 251/278

(under subclass 277) Devices in which there is biasing means comprising a spring.