US PATENT SUBCLASS 251 / 273
.~.~ 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}
273.~.~ Internal thread

DEFINITION

Classification: 251/273

(under subclass 264) Devices having its thread element mounted in a recess or a ring for cooperation with an external thread on the valve body.