Issued Patents 1982
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4339941 | Method and apparatus for producing thick welded steel pipe | Toshio Ishihara, Hiromichi Itoshima, Yutaka Mihara, Takashi Kogawa | 1982-07-20 |
| 4320277 | Thick welded steel pipe of large diameter and production thereof | Kiyoteru Hirabayashi, Hiroyuki Ichinose, Osamu Hirano, Motoaki Suzuki | 1982-03-16 |