Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4806153 | Method and apparatus for investigating subsurface conditions | Katsuo Sakai, Yukio Sakai | 1989-02-21 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4806153 | Method and apparatus for investigating subsurface conditions | Katsuo Sakai, Yukio Sakai | 1989-02-21 |