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Léonard ('Léon') Piguet (1855-1901) joined his father Antoine Louis Piguet, in the company founded by Alphonse Duvergier (1811 (1818?)-1879), builder of stationary steam engines.
In 1879, the Piguets joined forces to found the company MM. Piguet et Compagnie.
1917 Company name: Établissements Piguet.
1920s Merged with the Dujardin de Lille company.
See French Wikipedia entry.