1. Mitsubishi Metal Corporation, Ltd. Central Research Institute 1-297 Kitabukuro-cho, Omiya-shi, Japan 330
2. Mitsubishi Metal Corporation Ltd., Okegawa Plant 1230 Shimohideya, Okegawa-shi, Japan 363
3. Japan Atomic Energy Research Institute Tokai Research Establishment, Tokai-mura, Naka-gun, Ibaraki-ken, Japan 319-11