US PATENT SUBCLASS 33 / 814
.~.~.~ Differential screw


Current as of: June, 1999
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33 /   HD   GEOMETRICAL INSTRUMENTS

700  DF  DISTANCE MEASURING {13}
783  DF  .~ Opposed contacts {10}
813  DF  .~.~ Micrometer {10}
814.~.~.~ Differential screw


DEFINITION

Classification: 33/814

Differential screw:

(under subclass 813) Subject matter wherein one of the contacts is advanced by the difference between the movement produced by two threaded elements.