US PATENT SUBCLASS 968 / 537-- .~.~.~.~ Systems in which slave clocks function as master clocks for other slave clocks (synchronization of independently driven clocks subclass 506; setting subclass 498) [G04C 13/04B3]

US PATENT SUBCLASS 968 / 537
.~.~.~.~ Systems in which slave clocks function as master clocks for other slave clocks (synchronization of independently driven clocks subclass 506; setting subclass 498) [G04C 13/04B3]

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}
537		.~.~.~.~ Systems in which slave clocks function as master clocks for other slave clocks (synchronization of independently driven clocks subclass 506; setting subclass 498) [G04C 13/04B3]