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Twin Marchant Calculating Machine, c. 1942...
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Conto Model C Calculating Machine, 1912 ...
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Le Recta Adding Machine, c. 1912...
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Calculating Machines and Calculating Aids...
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2 Adix Adding Machines...
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Contex A Adding Machine, c. 1955...
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Curta Type I Calculator, 1952...
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Fuller's Computing Telegraph and Palmer's Poc...
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Calculating Machines and Calculating Aids...
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Calculating Discs and Calculating Aids...
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Omega Art-Nouveau Calculating Machine, 1904...
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Madas Calculating Machine, 1913...
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3 Calculating Discs...
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8 Calculating Clocks and Discs...
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Slide Rules and Arithmetic Tables...
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3 Sectors and a Rule...
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Rare Saxonia 3 (Rolltop) Calculator, 1910...
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Calculating Machines and Calculating Aids...
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Calculating Machines and Calculating Aids...
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Burkhardt Arithmometer, c. 1902...
