US PATENT SUBCLASS 968 / 836
.~ Means used apart from the timepiece for starting or stopping same [G04F 7/10]
Current as of:
June, 1999
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968 /
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HOROLOGY
831
DD
APPARATUS FOR MEASURING UNKNOWN TIME INTERVALS BY MECHANICAL MEANS [G04F 7/00]
{3}
836
.~ Means used apart from the timepiece for starting or stopping same [G04F 7/10]