US PATENT SUBCLASS 968 / 757
.~.~ With regard to the functioning of the automatic winding-up device [G04D 7/00K4]


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968 /   HD   HOROLOGY

748  DD  MEASURING, COUNTING, CALIBRATING, TESTING, OR REGULATING APPARATUS (measuring devices and calibers in general G01B; counters in general H03K) [G04D 7/00] {11}
754  DD  .~ Testing apparatus for complete clockworks with regard to external influences or general good working [G04D 7/00K] {3}
757.~.~ With regard to the functioning of the automatic winding-up device [G04D 7/00K4]