| 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} |
| 490 | DD | .~ Incorporating a stepping motor (subclasses 302 to 488 take precedence) generating timing pulses subclasses 817 and 901; setting subclass 906; synchronization subclass 920; generating commutating pulses in masterclocks subclasses 525 and 541; slave clocks actuated intermittently by electromechanical step-advancing mechanisms subclass 548; control circuits for stepping motors in general H02P 8/00) [G04C 3/14] {2} |
| 491 | | .~.~ Means to reduce power consumption by reducing pulse width or amplitude and related problems, e.g., detection of unwanted or missing step, etc. [G04C 3/14B] |