US PATENT SUBCLASS 968 / 832
.~ By measuring the distance of fall or the final velocity of a falling body [G04F 7/02]


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968 /   HD   HOROLOGY

831  DD  APPARATUS FOR MEASURING UNKNOWN TIME INTERVALS BY MECHANICAL MEANS [G04F 7/00] {3}
832.~ By measuring the distance of fall or the final velocity of a falling body [G04F 7/02]