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Publication of CH557260A4publicationCriticalpatent/CH557260A4/xx
Publication of CH366248ApublicationCriticalpatent/CH366248A/de
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