US PATENT SUBCLASS 968 / 511
.~.~ Provided with arrangements to prevent synchronization by interfering signals [G04C 11/02B]


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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}
510  DD  .~ By radio (time setting brought into action by radio subclass 499) [G04C 11/02] {2}
511.~.~ Provided with arrangements to prevent synchronization by interfering signals [G04C 11/02B]