US PATENT SUBCLASS 968 / 506
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]


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968 /   HD   HOROLOGY

506SYNCHRONIZATION 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}
507  DD  .~> By changing the driving speed [G04C 11/00B]
508  DD  .~> By changing the ratio of the driving gear [G04C 11/00C]
509  DD  .~> By positioning of the index or by regulating the length of the pendulum in dependence on the time difference with a standard [G04C 11/00H]
510  DD  .~> By radio (time setting brought into action by radio subclass 499) [G04C 11/02] {2}
513  DD  .~> Over a line (transmitting time signals over telephone networks H04M 11/06; time setting subclass 498) [G04C 11/04] {2}
516  DD  .~> With direct mechanical action on the time-indicating means (time setting subclass 498) [G04C 11/06]
517  DD  .~> Using an electro-magnet or -motor for oscillation correction [G04C 11/08] {2}