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4 Mechanical Calculating Machines...
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2 Machine Running Times Quick Calculators...
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Herrmann's Rechenknecht, 1875...
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The "Small" Pocket Calculator, c. 1915...
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8 Calculating Clocks...
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The Adder English Adding Machine, c. 1915...
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4 Early Arithmetic Tools...
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The Millionaire Calculating Machine, c. 1900...
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Thomas de Colmar Arithmomètre, c. 1876...
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French "Système Ader" Wall Telephone, c. 1880...
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L.M. Ericsson Telephone with Whistle Calling...
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Accurate Replica of Alexander Graham Bell's T...
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2 French Telephones...
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8 German Telephones...
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Telegraph Patent Model by White & White, 1855...
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English Telegraph Station by Tyer & Co., c. 1...
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3 Early Recorders...
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French Telegraph Repeater, 1912...
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Early French Breguet Dial Telegraph Parts, c....
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Marconi Telegrapher's Time Code Watch, Early ...
