US PATENT SUBCLASS 251 / 252
.~.~ Co-axial or parallel axes

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.~.~ Co-axial or parallel axes {1}
253  DF  .~.~.~> Biased {2}

DEFINITION

Classification: 251/252

(under subclass 251) Devices comprising a helical rib or surface the longitudinal axis of which is co-axial with or parallel to the axis along which the valve reciprocates.