Issued Patents 1989
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4863313 | Method for lining tunnel wall formed by shield excavation | Fumitaka Kumai | 1989-09-05 |
| 4851254 | Method and device for forming diamond film | Nobuei Ito, Hiroshi Uesugi, Tadashi Hattori | 1989-07-25 |
| 4823737 | Egg transfer device | Hideo Nakajima | 1989-04-25 |
| 4813813 | Method for constructing a tunnel | Yoshiharu Kiritani | 1989-03-21 |