Keywords: Marchant calculator, 1911 - Ridai Museum of Modern Science, Tokyo - DSC07597.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 12 50 own Daderot other versions cc-zero Marchant calculators in the Ridai Museum of Modern Science |