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Reusch, illustration for calculator ad, 1926. Hamann-Manus, Berlin. From the magazin Gebrauchsgraphi

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Development of Numerals from Zero, from: Allgemeine deutsche Rechenstunden, 1809. Woodcut. Germany.

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Oh Ya & Oh Tani, Soroban– Japanese Abacus, 1900. Wood, bamboo. Smithsonian Institution, National

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