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| View Original: | Busicom HL-21 calculator - Ridai Museum of Modern Science, Tokyo - DSC07611.JPG (5472x3239) | |||
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| Keywords: Busicom HL-21 calculator - Ridai Museum of Modern Science, Tokyo - DSC07611.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 16 18 own Daderot other versions cc-zero Mechanical calculators in the Ridai Museum of Modern Science Busicom calculators | ||||
