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| View Original: | Triumphator CRN1 calculator - Ridai Museum of Modern Science, Tokyo - DSC07658.JPG (4881x3368) | |||
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| Keywords: Triumphator CRN1 calculator - Ridai Museum of Modern Science, Tokyo - DSC07658.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 24 33 own Daderot other versions cc-zero Mechanical calculators in the Ridai Museum of Modern Science Triumphator calculators | ||||
