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Keywords: Produx Multator 26 - Ridai Museum of Modern Science, Tokyo - DSC07523.JPG en Exhibit in the Ridai Museum of Modern Science Tokyo University of Science Kagurazaka campus - 1-3 Kagurazaka Shinjuku-ku Tokyo 2015-02-20 02 01 52 own Daderot other versions cc-zero Portable mechanical calculators in the Ridai Museum of Modern Science Produx calculators |