Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5704243 | Forming method and forming stand for welded pipes | Kenji Hada, Daigo Sumimoto | 1998-01-06 |
| 5213633 | Electric resistance welded steel tube for machine structural use exhibiting outstanding machinability | Kenji Hada, Daigo Sumimoto | 1993-05-25 |