Timekeeping instruments. Wrist-chronometers with spring balance oscillator Ingestion-build-58863 The types of fixings and

The types of fixings and sizes described are normally used on heavy commercial vehicles

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Timekeeping instruments. Wrist-chronometers with spring balance oscillator Ingestion-build-58863 The types of fixings and1 Scope This International Standard lays down the definition of the term chronometer, describing the categories, the test programme and the acceptable minimum requirements for wrist chronometers. NOTE Wristwatches using a tuning fork oscillator are subjected to these tests pending the availability of separate standards.