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Category:Calculators

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A calculator created by Otto Steiger and Hans W. Egli on 1899 - Image by Dori and the Champaign County Historical Museum.
A calculator created by Otto Steiger and Hans W. Egli on 1899 - Image by Dori and the Champaign County Historical Museum.

A device used to perform basic arithmetic

Media in category "Calculators"

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