1. Sumitomo Metal Industries, Ltd., Central Research Laboratories 1-3, Nishinagasu-hondori, Amagasaki, 660, Japan
2. Sumitomo Metal Industries, Ltd., Steel Tube Works 1, Nishino-cho, Higashimukouzima, Amagasaki, 660, Japan
3. Mitsubishi Heavy Industries, Ltd., Kobe Shipyard and Engine Works 1-1, 1-chome, Wadasaki-cho, Hyogo-ku, Kobe, 652, Japan
4. Mitsubishi Heavy Industries, Ltd., Takasago Technical Institute, 2-1-1, Shinhama, Arai-cho, Takasago, 676, Japan