US PATENT SUBCLASS 968 / 513
.~ Over a line (transmitting time signals over telephone networks H04M 11/06; time setting subclass 498) [G04C 11/04]


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968 /   HD   HOROLOGY

506  DD  SYNCHRONIZATION OF INDEPENDENTLY DRIVEN CLOCKS (synchronization between master and slave pendulums subclass 532; synchronization of electronic oscillators in general H03L 7/00) [G04C 11/00] {7}
513.~ Over a line (transmitting time signals over telephone networks H04M 11/06; time setting subclass 498) [G04C 11/04] {2}
514  DD  .~.~> Provided with arrangements to prevent synchronization by interfering signals [G04C 11/04B]
515  DD  .~.~> The timepiece preparing itself on set time on the reception of the synchronizing signal [G04C 11/04C]