Jean Adrien Philippe invented the slipping spring (French patent No. 58 941), which prevented overtensioning of mainspring. The slipping spring remains an indispensable component of self-winding watches to this day.
This invention allowed the springs to be wound in two connected barrels at the same time and resulted in the development of self-winding watches.
Application: Tomasz Jakubas
Other records: Timeline of Watchmaking Innovations