1. Steel Research Labs., Nippon Steel Corp.
2. Steel Research Labs., now Yawata R&D Lab., Nippon Steel Corp.
3. Steel Research Labs., now Kimitsu R&D Lab., Nippon Steel Corp.
4. Steel Research Labs., now Hirohata R&D Lab., Nippon Steel Corp.
5. Kimitsu R&D Lab., Nippon Steel Corp.
6. Hirohata R&D Lab., Nippon Steel Corp.