US PATENT SUBCLASS 968 / 674
.~.~ For springs of driving mechanisms (machines therefor subclass 710) [G04D 1/04B]


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968 /   HD   HOROLOGY

651  DD  GRIPPING, HOLDING OR SUPPORTING DEVICES (stands in general F16M; for instruments G01D 11/30, B01L) [G04D 1/00] {10}
673  DD  .~ Tools for setting springs [G04D 1/04] {2}
674.~.~ For springs of driving mechanisms (machines therefor subclass 710) [G04D 1/04B]