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| Keywords: Ryoichi Yazu & calculator.jpg en Ryoichi Yazu and his Patent Yazu Arithmometer ja 矢頭良 と発明した 自働算盤 Source http //www xnumber com/xnumber/japanese_calculators htm Up loaded by Namazu-tron Up loaded on March 22 2009 PD-Japan-oldphoto Portraits of men Mechanical calculators | ||||
