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3 Adding Machines...
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3 Calculating Devices...
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4 British Calculating and Measuring Instrumen...
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3 American Disc Adders...
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3 American Disc Adders...
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Adders, Slide Rules and Calculating Aids...
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Group of Slide Rules...
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Comptometer Model No. 1, 1887...
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The Calculus Calculator, 1907...
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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...
