Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4376528 | Steel pipe hardening apparatus | Toshio Ohshimatani, Yukihiro Mimura, Kengo Nozawa, Tatsuo Maguchi | 1983-03-15 |
| 4282047 | Method of producing steel pipe material for oil well | Mitsukuni Yamagata, Sadao Hasuno, Kuniaki Motoda | 1981-08-04 |