| 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} |
| 480 | DD | .~ Wherein movement is regulated by a mechanical oscillator other than a pendulum or balance, e.g., by a tuning fork, e.g., electrostatically, etc. [G04C 3/08] {2} |
| 481 | DD | .~.~ Driven by electromagnetic means [G04C 3/10] {2} |
| 482 | DD | .~.~.~ Constructional details [G04C 3/10B] {3} |
| 486 | | .~.~.~.~ Controlling frequency or amplitude of the oscillating system (circuits subclass 487) [G04C 3/10B4] |