US PATENT SUBCLASS 968 / 536
.~.~.~.~ By using devices similar to slave clocks [G04C 13/04B2]


Current as of: June, 1999
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968 /   HD   HOROLOGY

524  DD  DRIVING MECHANISMS FOR CLOCKS BY MASTER CLOCKS [G04C 13/00] {2}
525  DD  .~ Circuit arrangements; electric clock installations [G04C 13/02] {5}
534  DD  .~.~ Master clocks [G04C 13/04] {4}
535  DD  .~.~.~ Monitoring or controlling master clock or system with more than one master clock, e.g., for switching over to standby motor or power system, etc. [G04C 13/04B] {2}
536.~.~.~.~ By using devices similar to slave clocks [G04C 13/04B2]