Invented a pinion-cutting machine.

Foundation of the first Le Coultre Manufacture workshop, today know as Jaeger-LeCoultre. 

Invented the Millionometer (instrument to measure the micron).

Invention of the swing winder, one of the first reliable systems to wind a watch and set it without having to use a key.

The first mechanically-made repetition calibres and chronograph.

Invented a new winding mechanism.

Charles Antoine Le Coultre gradually retired. His three sons took over the factory with Edmond Jaeger at the beginnig of 1900. His grandson, Jacques-David LeCoultre, formed a partnership with the French watchmaker in 1903.