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Split-seconds chronographA split second chrongraph is a chronograph watch that can be used for the simultaneous timing of several events that begin at the same time but last for different lengths of time. This is done with two superimposed coaxial second hands - the chronograph hand and the sweep hand (rattrapante). While the chronograph hand only stops at the end of the timing, the sweep hand can make intermediate stops, but can also be made to join the chronograph hand.Split second chronographs were first introduced in 1880. Production of the present watch, the Patek Philippe reference 5004, started in 1995 and combines a split second chronograph wristwatch with perpetual calendar and phases of the moon.