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Comptometer
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==External links== *{{Commons category-inline}} *[https://web.archive.org/web/20170325135139/http://www2.cruzio.com/~vagabond/ComptHome.html Comptometer "Biography of a Machine"] β extensive history, model information, and Dorr Felt biography, archived - retrieved August 30, 2017. *[http://www.rechenmaschinen-illustrated.com/pictures_1820.htm#Comptometer www.rechenmaschinen-illustrated.com] *[http://www.johnwolff.id.au/calculators/comptometers/comptometers.htm Comptometers and Key-Driven Calculators] β more photos and descriptions of models, retrieved April 11, 2007 *[https://web.archive.org/web/20170202040444/http://www.ami19.org/indexEnglish.html ami19.org] β Patents and articles on 19th-century mechanical calculators *[http://www.ed-thelen.org/comp-hist/Comptometer-instructions.html Comptometer instruction manual], retrieved April 11, 2007 *[https://web.archive.org/web/20080214045844/http://content.zdnet.com/2346-9595_22-160275-9.html Comptometer photo], retrieved August 21, 2007. *[https://www.youtube.com/watch?v=SbJpufimfdM How the Comptometer Works] β animated video describing in detail how the Model F Comptometer works, retrieved February 1, 2012. * [https://en.wikisource.org/wiki/Methods_of_Operating_the_Comptometer Methods of Operating the Comptometer] - transcription of the first edition of the official Operating Manual for the Comptometer, from 1895. {{Calculator navbox}} [[Category:1887 introductions]] [[Category:Mechanical calculators]] [[Category:American inventions]] [[Category:Mechanical calculator companies]] [[Category:Inventions in the Smithsonian Institution]]
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