| 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 | | .~.~.~.~ Driving circuits with distinct detecting and driving coils [G04C 3/06F3] {1} |
| 478 | DD | .~.~.~.~.~> Provided with automatic control [G04C 3/06F3B] |