US PATENT SUBCLASS 251 / 227
.~.~.~ Spring

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

213  DF  MECHANICAL MOVEMENT ACTUATOR {10}
215  DF  .~ Plural motions of valve {5}
226  DF  .~.~ Biased {1}
227.~.~.~ Spring

DEFINITION

Classification: 251/227

(under subclass 226) Devices in which the biasing means is a spring.