US PATENT SUBCLASS 968 / 577
PRODUCING OPTICAL TIME SIGNALS AT PREFIXED TIMES BY ELECTRIC MEANS [G04C 19/00]


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968 /   HD   HOROLOGY

577PRODUCING OPTICAL TIME SIGNALS AT PREFIXED TIMES BY ELECTRIC MEANS [G04C 19/00] {2}
578  DD  .~> By electric lamps [G04C 19/02]
579  DD  .~> By indicating members moved electrically, e.g., flap, band, etc. [G04C 19/04]