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"Certa" Adding Machine...
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Olympia CD-400 Desktop Calculator, 1970...
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"Robotron Mod. 314", 1972...
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"Tim Unitas", 1912...
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Swiss "Conto" Model C Calculating Machine, 19...
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"Mercedes-Euklid Mod. 1", 1905...
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Calculating Drum by Ernst Billeter, Zurich, S...
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"Multifix", c. 1950...
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2 Fast Adders...
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"The Locke Adder", 1901...
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"Universal-Adder", 1904...
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"The Rapid" and "Golden Gem"...
