US PATENT SUBCLASS 968 / 526
.~.~ Master-slave systems using transmission of singular pulses for driving directly slave clocks step-by-step (subclass 533 takes precedence) [G04C 13/02B]


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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.~.~ Master-slave systems using transmission of singular pulses for driving directly slave clocks step-by-step (subclass 533 takes precedence) [G04C 13/02B] {4}
527  DD  .~.~.~> Via existing power distribution lines [G04C 13/02B2]
528  DD  .~.~.~> Via existing transmission lines (transmitting time signals over telephone networks H04M 11/06) [G04C 13/02B3]
529  DD  .~.~.~> Via special lines [G04C 13/02B4]
530  DD  .~.~.~> By radio [G04C 13/02B5]