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Arithmometer Hugo Bunzel, Vienna, c. 1902...
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Finnish Disc Adder by Hedberg, 1924...
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Arithmometer "Tim", 1909...
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Collection of Adding Machines, 1920-60...
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XxX ('X multiplied by X') Calculating Machine...
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Curta Type I Calculator, 1963...
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Walther Diwa 32 Calculating Machine, 1970-72...
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2 Logarithmic Calculating Drums...
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Commodore PET 2001 ("Blue PET"), 1977...
