Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4846904 | Martensitic stainless steel having excellent hardness by subzero treatment | Tadahiko Murakami, Kazuo Mashimo, Jyou Tanioka | 1989-07-11 |
| 4806927 | Communication control method | — | 1989-02-21 |