77:, where upholstered chairs and sofas were fitted with metal springs. He adapted them into his chairs and bed bases, thus creating the "sommier élastique" (Eng:"Box-Spring") (French for bed base with elastic/spring suspension). The advantage of the bed base was that a much thinner mattresses could be produced, thus saving material. The bed base consisted of a combination of natural fillings and metal springs, thus enhancing the comfort. The invention initially saw limited commercial success, but it was later sold by a succession of several new owners under the name "Literie Darrac" in
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Archives des découvertes et des inventions nouvelles: faites dans les sciences, les arts et les manufactures, tant en France que dans les pays étrangers ... 1808-1839; avec l'indication succincte des principaux produits de l'industrie française; la liste des brevets d'invention, de perfectionnement
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et d'importation, délivrés par le gouvernement ... et des notices sur les prix proposés ou décernés par différentes sociétés savantes, françaises et étrangères, pour l' encouragement des sciences et des arts
66:(Brevet d'invention) for five years for his new methods for upholstering furniture and his new method of producing a
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103:"Muzéo Collection : Triptyque de la Trinité. - Bellegambe Jean (vers 1470-vers 1534), le Maître des couleur"
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fitted with a combination of natural comfort fillers and metal springs, thus creating the spring mattress.
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51:. He was first an apprentice of Michel-Jacques Boulard (1761–1825). Darrac's work can be found in the
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47:. Darrac was one of the most important upholsterers of his generation. He was upholsterer for the
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81:. Darrac's invention was later perfected and used in
160:Les Ébénistes Parisiens du XIX siècle (1795-1870)
168:"Stamboom van François-Louis Castelnaux-Darrac"
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134:. Treuttel et Würtz. 1815. pp. 398–.
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73:Darrac got his idea for his patent in
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162:. Paris: F. De Nobele. p. 122.
62:. In August 1812, he was granted a
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34:François Louis Castelnaux Darrac
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