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Couesnon & Cie.
A.G. Guichard started business in 1827 in Chateau-Thierry and was joined by his Brother-in-Law P.L. Gautrot in 1835. Gautrot took over the whole firm in 1845. After his death in 1882 his Son-in-Law Amedée Couesnon took over the firm and renamed it Couesnon, Gautrot et Cie, and from 1888, Couesnon et Cie. In the late 19th and early 20th century they expanded to eleven factories and over 1000 employees, but in the 1920's business declined. Taken over by PGM in 1999, the company was in business as PGM Couesnon until 2023.