US PATENT SUBCLASS 968 / 553
CLOCKS DRIVEN BY SYNCHRONOUS MOTORS [G04C 15/00]


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968 /   HD   HOROLOGY

553CLOCKS DRIVEN BY SYNCHRONOUS MOTORS [G04C 15/00] {4}
554  DD  .~> Without power reserve [G04C 15/00B] {4}
559  DD  .~> With power reserve [G04C 15/00C]
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}
563  DD  .~> Lubricating [G04C 15/00T]