US PATENT SUBCLASS 251 / 276
.~.~.~.~ 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}
274  DF  .~.~ Encased {1}
275  DF  .~.~.~ Biased {1}
276.~.~.~.~ Spring

DEFINITION

Classification: 251/276

(under subclass 275) Subject matter wherein the biasing means is a spring.