US PATENT SUBCLASS 968 / 517
.~ Using an electro-magnet or -motor for oscillation correction [G04C 11/08]


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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.~ Using an electro-magnet or -motor for oscillation correction [G04C 11/08] {2}
518  DD  .~.~> Using an electromagnet [G04C 11/08K] {2}
521  DD  .~.~> Using an electromotor [G04C 11/08M] {2}