US PATENT SUBCLASS 251 / 265
.~.~ Plural 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}
265.~.~ Plural thread

DEFINITION

Classification: 251/265

(under subclass 264) Devices having plural sets of threads which co-act to accelerate the motion of the valve head.