mechanical calculator Museum of Design in Plastics
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Retro art comes in from the cold: Berlin exhibit lifts iron curtain
Monroe Model LA5-160 Calculating Machine
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File:Calculator, Model 41 PD, Logos, designed by Mario Bellini, Olivetti & Co., Milan, 1977, plastic case - Museum für Angewandte Kunst Köln - Cologne, Germany - DSC09677.jpg - Wikimedia Commons
Mechanical calculator - Wikiwand
