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Keywords: Tiger H62-20 calculator - Ridai Museum of Modern Science, Tokyo - DSC07640.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 20 55 own Daderot other versions cc-zero Mechanical calculators in the Ridai Museum of Modern Science Tiger calculating machine |