US PATENT SUBCLASS 968 / 478
.~.~.~.~.~ Provided with automatic control [G04C 3/06F3B]


Current as of: June, 1999
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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}
475  DD  .~.~.~ The balance controlling gear-train by means of static switches, e.g., transistor circuits, etc. (synchronization of balance subclass 520) [G04C 3/06F] {3}
477  DD  .~.~.~.~ Driving circuits with distinct detecting and driving coils [G04C 3/06F3] {1}
478.~.~.~.~.~ Provided with automatic control [G04C 3/06F3B]