Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4341938 | Method and apparatus for seam-welding steel pipes | Hiroyoshi Matsubara, Kenji Takeshige, Tatsumi Osuka, Takashi Nagamine, Osamu Hirano +2 more | 1982-07-27 |
| 4238659 | Preventing magnetization of pipe blank in GMA welding | Fusao Koshiga, Itaru Watanabe, Motoaki Suzuki, Toshifumi Kojima, Hiroyoshi Matsubara +4 more | 1980-12-09 |