Issued Patents 1989
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4854787 | Boring device | Yasumasa Ooki, Osamu Asano | 1989-08-08 |
| 4827905 | Outer glass pipes for solar heat collector pipes | Hirosato Takeuchi | 1989-05-09 |
| 4820088 | Boring device | Yasumasa Ooki, Osamu Asano | 1989-04-11 |
| 4807606 | Therapeutic appliance for improving functions of hand fingers | Tsuneo Hasegawa, Mitsuma Matsumura, Atsuki Hashimoto | 1989-02-28 |