Jaeger LeCoultre is a traditional watch manufacturer from Switzerland. In 1833 Charles Antoine LeCoultre and his brother Francoise Ulysse LeCoultre founded a gear manufacturing company in La Sentier in the Swiss Jura. Charles was an ingenious inventor. The millionometer he invented made it possible to measure mechanical components down to a thousandth of a millimeter. Other inventions, such as that of the crown elevator, established the company's reputation as a manufacturer of complex watch movements.