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ISO 3159:1976
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ISO 3159:1976 Timekeeping instruments -- Wrist-chronometers with spring balance oscillator
standard by International Organization for Standardization, 02/01/1976
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Full Description
Lays down the definition of the term "chronometer", describing the categoeries, the test programme and the acceptable minimum requirements for wrist-chronometers. Wristwatches using a tuning fork oscillator are subjected to these tests pending the availability of separate standards.