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| View Original: | Sharp calculators with abaci, Japan - Ridai Museum of Modern Science, Tokyo - DSC07477.JPG (4528x3595) | |||
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| Keywords: Sharp calculators with abaci, Japan - Ridai Museum of Modern Science, Tokyo - DSC07477.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 01 54 08 own Daderot other versions cc-zero Abaci in the Ridai Museum of Modern Science Sharp calculators with abaci | ||||
