US PATENT SUBCLASS 251 / 321
.~.~.~ Spring

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

318  DF  RECIPROCATING VALVE {7}
319  DF  .~ Push or pull operator {1}
320  DF  .~.~ Biased {1}
321.~.~.~ Spring {2}
322  DF  .~.~.~.~> Spring stop on valve stem
323  DF  .~.~.~.~> Spring abuts valve stem guide

DEFINITION

Classification: 251/321

(under subclass 320) Valves having a spring biased valve.