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| View Original: | Odhner 7 calculator - Ridai Museum of Modern Science, Tokyo - DSC07615.JPG (4055x3350) | |||
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| Keywords: Odhner 7 calculator - Ridai Museum of Modern Science, Tokyo - DSC07615.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 32 own Daderot other versions cc-zero Odhner calculators in the Ridai Museum of Modern Science | ||||
