| 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} |
| 453 | DD | .~ Wherein movement is regulated by a pendulum [G04C 3/02] {5} |
| 458 | DD | .~.~ Using electromagnetic coupling between electric power source and pendulum (subclass 464 takes precedence) [G04C 3/027] {5} |
| 460 | | .~.~.~ The pendulum controlling contacts, thereby electromagnetically driving the gear-train or several gear-trains (generating driving pulses in master-clocks subclass 541) [G04C 3/027C] |