US PATENT SUBCLASS 968 / 542
.~.~.~.~ By starting an independent mechanical driving device, e.g., motor controlling the contacts, etc. [G04C 13/04D2]


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968 /   HD   HOROLOGY

524  DD  DRIVING MECHANISMS FOR CLOCKS BY MASTER CLOCKS [G04C 13/00] {2}
525  DD  .~ Circuit arrangements; electric clock installations [G04C 13/02] {5}
534  DD  .~.~ Master clocks [G04C 13/04] {4}
541  DD  .~.~.~ Arrangements for generating normal driving pulses (generating timing pulses in general subclass 817) [G04C 13/04D] {3}
542.~.~.~.~ By starting an independent mechanical driving device, e.g., motor controlling the contacts, etc. [G04C 13/04D2]