US PATENT SUBCLASS 968 / 531
.~.~ Master-slave systems using transmission of other driving signals, e.g., coded signals, etc. [G04C 13/02F]


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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}
531.~.~ Master-slave systems using transmission of other driving signals, e.g., coded signals, etc. [G04C 13/02F]