Willy Breitling filed a patent for the chronograph with two pushers. He has added a second button to reset chronograph. The invention makes it possible to measure several short periods of time and to sum them up with the first button.
Today most modern watches with a stopwatch have two buttons to operate the stopwatch, referring to Breitling's original idea.
Application: Damian Szojda
Other records: Timeline of Watchmaking Innovations