At this time, the end of the sixth millennium and the fifth millennium BC, the first Neolithic cultural groups appear in Egypt. The quantity of archaeological finds does not yet allow us to trace the merging of the Epipaleolithic traditions of the Nile Valley with the cultures of immigrant groups.
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Definition. A chronograph is a watch with timekeeping capability as well as the ability to function as a stopwatch. A chronograph can be equipped with as few as one or as many as four sub-dials, depending upon the precision and design of the watch. chronograph is any watch with a separate stopwatch feature, and its precision can vary; but chronographs tend to be very precise, as they are usually offered on high-end Swiss timepieces. A chronometer, however, is an officially certified chronograph whose precision has been tested.