@patent{thomas_de_colmar_calculatine_1851,
	address = {London},
	title = {Calculatine machine - {De} {Colmar}'s specification},
	url = {http://arithmometre.org/Bibliotheque/BibNumerique/Brevet1851Anglais/BrevetAnglais1851-N13504.pdf},
	abstract = {Brevet anglais de l'arithmomètre Thomas},
	nationality = {UK},
	number = {13504},
	author = {Thomas de Colmar, Charles-Xavier},
	year = {1851},
}

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