Furukawa Ichibei, who overcame many difficulties and achieved the success of Ashio Copper Mine, decided to establish a copper plant in Fukagawa in 1884 in order to improve the inhomogeneity of the blister copper produced. At the same time, inventor Yoichi Yamada, who was researching rubber-coated electric wire manufacturing methods in Yokohama, established an electric wire manufacturing factory in Takashima-cho, Yokohama.
The origin of these two businesses is the