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In 1833, Antoine LeCoultre (1803-1881) founded a small watchmaking workshop in Le Sentier. In 1844, he invented the world’s most precise measuring instrument, the Millionomètre. The collaboration between Jaeger and LeCoultre led to the company being officially renamed Jaeger-LeCoultre in 1937. Since Jaeger-LeCoultre’s founding, the company has produced over 1,242 different calibres, registered approximately 400 patents and created hundreds of inventions. In 1907, the LeCoultre Calibre 145 set the record for the world’s thinnest movement at 1.38 mm thick, appearing in pocket watches that remain to this day the thinnest in their category. Remarkable is also “The Atmos Clock” which is a timepiece of near-perpetual movement needing no human intervention and almost no energy. It derives energy from small Temperature and Atmospheric pressure changes in the environment, and can run for years without human intervention (a 1 °C fluctuation is enough to store sufficient energy to supply the clock with two days autonomy). Today, Jaeger-LeCoultre offers eight distinct collections of timepieces and maintains multiple partnerships in diverse sectors, such as marine preservation, motorsports and polo. The company has been a fully owned subsidiary of the Swiss luxury group Richemont since 2000.