Japan | Steel Manufacturing Nippon Steel, JFE Steel, Kobe Steel, Sumitomo Metal Industries, Nisshin Steel, Nippon Denko, Chuo Denki KogyoCivil Engineering Asunaro Aoki Construction, Obayashi Corp., Okumura Corp., Kumagaigumi, Konoike Construction, Hazama Corporation, Kajima Corporation, Penta Ocean Construction, Shimizu Corporation, Taisei Corporation, Tobishima Corporation, Nishimatsu Construction, Maeda Seisakusho, Yamamoto Manufacturing Co. |
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Overseas | Iwaden 岩安有限公司 (Taiwan), JOEU (South Korea), Fen (China) |