US PATENT SUBCLASS 251 / 267
.~.~.~ Internal thread

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}
266  DF  .~.~ Non-reciprocating actuator {3}
267.~.~.~ Internal thread {1}
268  DF  .~.~.~.~> Inverted cup-shape {1}

DEFINITION

Classification: 251/267

(under subclass 266) Devices which are internally threaded.