US PATENT SUBCLASS 968 / 831
APPARATUS FOR MEASURING UNKNOWN TIME INTERVALS BY MECHANICAL MEANS [G04F 7/00]


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968 /   HD   HOROLOGY

831APPARATUS FOR MEASURING UNKNOWN TIME INTERVALS BY MECHANICAL MEANS [G04F 7/00] {3}
832  DD  .~> By measuring the distance of fall or the final velocity of a falling body [G04F 7/02]
833  DD  .~> Using a mechanical oscillator [G04F 7/04] {2}
836  DD  .~> Means used apart from the timepiece for starting or stopping same [G04F 7/10]