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Patent Model by E.L. Bill, 1878...
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Original Patent Model by F.S. Baldwin, 1873...
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Curta Type II Calculator (Black), 1955...
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2 American Adding Machines...
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2 American Adding Machines...
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9 Calculating Discs...
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18 Calculating Tools...
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4 American Disc Adders...
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The "Small" Pocket Calculator, c. 1900...
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Early American Monetary Transaction Table, 18...
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2 American Disc Adders...
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Calculimetre Calculating Disc, c. 1875...
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The Adder, 1868...
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18 Calculating Tools...
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"Quixsum Fractional Adding Machine Mod. C" Di...
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Comptograph, c. 1898...
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XxX ('X multiplied by X') Keyboard Calculatin...
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Adding Machine The Acme, c. 1902...
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2 American Disc Adders...
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Key Adding & Subtracting Machine, 1925...
