US PATENT SUBCLASS 968 / 471
.~.~.~ The balance controlling contacts and mechanically driving the gear-train [G04C 3/06B]


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968 /   HD   HOROLOGY

446  DD  ELECTROMECHANICAL CLOCKS OR WATCHES INDEPENDENT OF OTHER TIMEPIECES AND IN WHICH THE MOVEMENT IS MAINTAINED BY ELECTRIC MEANS (synchronization subclass 506) [G04C 3/00] {8}
466  DD  .~ Wherein movement is regulated by a balance (construction thereof subclass 110) [G04C 3/04] {2}
470  DD  .~.~ Using electromagnetic coupling between electric power source and balance [G04C 3/06] {5}
471.~.~.~ The balance controlling contacts and mechanically driving the gear-train [G04C 3/06B]