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The Olivetti Summa 19: the last mechanical calculator - Italian Ways | Tech design, Design classes, Memphis design
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File:Olivetti, Una bella società - MC 4S Macchina Calcolatrice 4 Summa, 1940 (2677178265).jpg - Wikimedia Commons
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The Olivetti Divisumma 18 calculator: the lightness of numbers - Italian Ways | Calculator design, Pop design, Objects design
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