US PATENT SUBCLASS 968 / 578
.~ By electric lamps [G04C 19/02]
Current as of:
June, 1999
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968 /
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HOROLOGY
577
DD
PRODUCING OPTICAL TIME SIGNALS AT PREFIXED TIMES BY ELECTRIC MEANS [G04C 19/00]
{2}
578
.~ By electric lamps [G04C 19/02]
