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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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FR815590A1960-01-121960-01-12Instrument servant à mesurer le temps de vol d'un aéronef
ExpiredFR1248708A
(fr)