US PATENT SUBCLASS 968 / 528
.~.~.~ Via existing transmission lines (transmitting time signals over telephone networks H04M 11/06) [G04C 13/02B3]


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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}
526  DD  .~.~ Master-slave systems using transmission of singular pulses for driving directly slave clocks step-by-step (subclass 533 takes precedence) [G04C 13/02B] {4}
528.~.~.~ Via existing transmission lines (transmitting time signals over telephone networks H04M 11/06) [G04C 13/02B3]