US PATENT SUBCLASS 251 / 254
.~.~.~.~ Bi-directional

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

213  DF  MECHANICAL MOVEMENT ACTUATOR {10}
251  DF  .~ Cam {3}
252  DF  .~.~ Co-axial or parallel axes {1}
253  DF  .~.~.~ Biased {2}
254.~.~.~.~ Bi-directional {1}
255  DF  .~.~.~.~.~> Non-reciprocating

DEFINITION

Classification: 251/254

(under subclass 253) Devices having plural cam surfaces arranged for actuation by selective rotation in opposite angular directions.