US PATENT SUBCLASS 968 / 843
.~ Means used apart from the timepiece for starting or stopping same [G04F 8/08]
Current as of:
June, 1999
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968 /
HD
HOROLOGY
837
DD
APPARATUS FOR MEASURING UNKNOWN TIME INTERVALS BY ELECTROMECHANICAL MEANS [G04F 8/00]
{4}
843
.~ Means used apart from the timepiece for starting or stopping same [G04F 8/08]