US PATENT SUBCLASS 968 / 688
.~.~.~ For springs (springs in general B21F; mainspring construction subclass 10; springs for the regulating mechanism subclass 701) [G04B 3/00B2B]


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968 /   HD   HOROLOGY

685  DD  WATCHMAKER'S OR WATCH-REPAIRER'S MACHINES OR TOOLS FOR WORKING MATERIALS (metal working in general Class B23) [G04D 3/00] {7}
686  DD  .~ For mechanical working other than with a lathe (lathes for watchmakers subclass 724) [G04D 3/00B] {10}
687  DD  .~.~ For parts of driving means [G04D 3/00B2] {2}
688.~.~.~ For springs (springs in general B21F; mainspring construction subclass 10; springs for the regulating mechanism subclass 701) [G04B 3/00B2B]