US PATENT SUBCLASS 968 / 519
.~.~.~ Acting on the pendulum (mutual synchronization of pendulums subclass 532) [G04C 11/08K5]


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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}
517  DD  .~ Using an electro-magnet or -motor for oscillation correction [G04C 11/08] {2}
518  DD  .~.~ Using an electromagnet [G04C 11/08K] {2}
519.~.~.~ Acting on the pendulum (mutual synchronization of pendulums subclass 532) [G04C 11/08K5]