@patent{thomas_de_colmar_brevet_1851,
	address = {Paris},
	title = {Brevet {N}° 10990 (\#6261) du 8 décembre 1850 + {Certificat} d'addition en date du 19 août 1851},
	url = {http://arithmometre.org/Bibliotheque/BibNumerique/Brevet1850/Brevet1850.html},
	nationality = {France},
	number = {10990 (\#6261°},
	author = {Thomas de Colmar, Charles-Xavier},
	year = {1851},
	pages = {19 pages},
}

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