US PATENT SUBCLASS 968 / 834
.~.~ Running only during the time interval to be measured, e.g., stopwatch, etc. [G04F 7/06]

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968 /   HD   HOROLOGY

831  DD  APPARATUS FOR MEASURING UNKNOWN TIME INTERVALS BY MECHANICAL MEANS [G04F 7/00] {3}
833  DD  .~ Using a mechanical oscillator [G04F 7/04] {2}
834.~.~ Running only during the time interval to be measured, e.g., stopwatch, etc. [G04F 7/06]