US PATENT SUBCLASS 968 / 839
.~ Running only during the time intervals to be measured, e.g., stopwatch, etc. [G04F 8/00C]
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968 /
HD
HOROLOGY
837
DD
APPARATUS FOR MEASURING UNKNOWN TIME INTERVALS BY ELECTROMECHANICAL MEANS [G04F 8/00]
{4}
839
.~ Running only during the time intervals to be measured, e.g., stopwatch, etc. [G04F 8/00C]
