US PATENT SUBCLASS 968 / 552
.~.~ By electrically released mechanical driving mechanisms [G04C 13/14]


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968 /   HD   HOROLOGY

524  DD  DRIVING MECHANISMS FOR CLOCKS BY MASTER CLOCKS [G04C 13/00] {2}
547  DD  .~ Slave clocks actuated intermittently [G04C 13/08] {3}
552.~.~ By electrically released mechanical driving mechanisms [G04C 13/14]