◇ Aichi Steel Corp
◇ Asahi Industries Co Ltd(Asahi Kogyo)
◇ Chubu Steel Plate Co Ltd
◇ Daido Steel Co Ltd
◇ Daisan Seiko KK
◇ Daito Industry Co Ltd
◇ Daiwa Steel Tube Industries Co Ltd
◇ Haneda Pipe Works Co Ltd
◇ Hitachi Metals Ltd(Hitachi Kinzoku)
◇ Hokkai Steel Works Co Ltd
◇ Kanto Special Steel Works Ltd
◇ Kawasaki Steel Corp
◇ Kawasaki Steel Metal Products & Engineering Inc-Ka
◇ Kobe Special Tube Co Ltd
◇ Kobe Steel Ltd
◇ Kubota Corp
◇ Kurimoto Ltd
◇ Kyoei Steel Ltd
◇ Kyushu Steel Corp
◇ Maruichi Steel Tube Ltd
◇ Mitsubishi Steel Manufacturing Co Ltd
◇ Mitsuboshi Kinzoku Kogyo Co Ltd
◇ Nachi Fujikoshi Corp
◇ Nakayama Kasei Ltd
◇ Nakayama Steel Works Ltd(Nakayama Seikosho)
◇ Nichia Steel Works Ltd
◇ Nippon Kinzoku Co Ltd
◇ Nippon Kokan Light Steel KK
◇ Nippon Koshuha Steel Co Ltd(Nippon Koshuha Kogyo
◇ Nippon Metal Industry Co Ltd (Nippon Kinzoku Kogy
◇ Nippon Metal Tube Co Ltd
◇ Nippon Steel Corp(NSC)
◇ Nippon Yakin Kogyo Co Ltd
◇ Nisshin A & C Co Ltd
◇ Nisshin Steel Co Ltd
◇ NKK Bars & Shapes Co Ltd
◇ NKK Corp
◇ NKK Steel Sheet & Strip Corp
◇ NKK Tubes
◇ Oji Steel Co Ltd
◇ Osaka Steel Co Ltd
◇ Sansaki Pipe Industries Co Ltd
◇ Sanyo Special Steel Co Ltd
◇ Shinkansai Steel Corp
◇ Sumitomo Metal Industries Ltd
◇ Sumitomo Pipe & Tube Co
◇ Taiyo Steel Co Ltd
◇ Takasago Tekko KK
◇ Toho Sheet & Frame Co Ltd
◇ Tohoku Steel Co Ltd
◇ Tokai Color Corp
◇ Tokai Steel Works Ltd(Tokai Kogyo)
◇ Tokushu Kinzoku Kogyo Co Ltd
◇ Tokyo Steel Manufacturing Co Ltd
◇ Toyo Kohan Co Ltd
◇ Usui Kokusai Sangyo Kaisha Ltd
◇ Yamato Kogyo Co Ltd
◇ Yodogawa Steel Works Ltd
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