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| View Original: | Odhner 30 calculator - Ridai Museum of Modern Science, Tokyo - DSC07617.JPG (3878x3230) | |||
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| Keywords: Odhner 30 calculator - Ridai Museum of Modern Science, Tokyo - DSC07617.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 17 44 own Daderot other versions cc-zero Odhner calculators in the Ridai Museum of Modern Science | ||||
