US PATENT SUBCLASS 968 / 562-- .~.~ Automatic stabilization of net frequency with regard to time, e.g., by comparing one of the clocks with an independent clock, means being provided for automatic compensation of disturbances, etc. [G04C 15/00H3]

US PATENT SUBCLASS 968 / 562
.~.~ Automatic stabilization of net frequency with regard to time, e.g., by comparing one of the clocks with an independent clock, means being provided for automatic compensation of disturbances, etc. [G04C 15/00H3]

968 /	HD	HOROLOGY

553	DD	CLOCKS DRIVEN BY SYNCHRONOUS MOTORS [G04C 15/00] {4}
560	DD	.~ Synchronous clock systems, e.g., provided with radiolink or using transmission of alternating current via existing power distribution lines, etc. [G04C 15/00H] {2}
562		.~.~ Automatic stabilization of net frequency with regard to time, e.g., by comparing one of the clocks with an independent clock, means being provided for automatic compensation of disturbances, etc. [G04C 15/00H3]