Issued Patents All Time
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5118220 | Method of building underground cavern and tunneling machine | Joji Nakamura | 1992-06-02 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5118220 | Method of building underground cavern and tunneling machine | Joji Nakamura | 1992-06-02 |