US PATENT SUBCLASS 968 / 547
.~ Slave clocks actuated intermittently [G04C 13/08]


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968 /   HD   HOROLOGY

524  DD  DRIVING MECHANISMS FOR CLOCKS BY MASTER CLOCKS [G04C 13/00] {2}
547.~ Slave clocks actuated intermittently [G04C 13/08] {3}
548  DD  .~.~> By electromechanical step-advancing mechanisms (independent clocks or watches incorporating a stepping motor subclass 490; stepping motors in general H02K 33/00) [G04C 13/10] {2}
551  DD  .~.~> By continuously rotating electric motors (independent clocks subclass 493; clocks driven by synchronous motors subclass 553) [G04C 13/12]
552  DD  .~.~> By electrically released mechanical driving mechanisms [G04C 13/14]