US PATENT SUBCLASS 968 / 525
.~ Circuit arrangements; electric clock installations [G04C 13/02]


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968 /   HD   HOROLOGY

524  DD  DRIVING MECHANISMS FOR CLOCKS BY MASTER CLOCKS [G04C 13/00] {2}
525.~ 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}
531  DD  .~.~> Master-slave systems using transmission of other driving signals, e.g., coded signals, etc. [G04C 13/02F]
532  DD  .~.~> Transmission systems for synchronization of pendulum of slave clocks by pendulums of master clocks [G04C 13/02K]
533  DD  .~.~> Pulse transmission systems with additional means for setting the time indication of slave clocks (subclass 532 takes precedence) [G04C 13/03]
534  DD  .~.~> Master clocks [G04C 13/04] {4}