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G04F7/00—Apparatus for measuring unknown time intervals by non-electric means
G04F7/04—Apparatus for measuring unknown time intervals by non-electric means using a mechanical oscillator
G04F7/06—Apparatus for measuring unknown time intervals by non-electric means using a mechanical oscillator running only during the time interval to be measured, e.g. stopwatches
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Physics & Mathematics
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CH3848A1891-08-011891-08-01Chronographe-compteur à quarts de seconde perfectionné
CH3848A
(fr)