Japan's big companies are Mitsubishi bought the island and a large coal mining development to cater for the needs of industrial development of coal in Japan.
Large Company of Japan, Mitsubishi bought the island. And develop a large coal mine to support the needs of developing coal industry in Japan at that time.
A large company of Japan's Mitsubishi bought the island. And the development of a large coal mines, to cater to the demand of coal in industrial development in Japan that era.