1828 - Chronograph counter for physics and astronomy with flyback hand
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1827 - chronograph counter for physics and astronomy with flyback hand, patent was officially registered in March 1828. That was Improvement of the chronograph a forerunner to the split second hand.
Source: perrelet.com, hautehorlogerie.org
Application: Władysław Meller
Other records: Timeline of Watchmaking Innovations
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