Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4836864 | Method of gas carburizing and hardening | Koji Murakami, Tsunao Shima, Akira Yokoyama | 1989-06-06 |
| 4807853 | Continuous furnace for gas carburizing and hardening | Koji Murakami, Tsunao Shima, Akira Yokoyama | 1989-02-28 |