Issued Patents 1982
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4352594 | Method and apparatus for constructing underground structure | Koichi Uemura | 1982-10-05 |
| 4322180 | Method and apparatus for advancing cylindrical bodies underground | Koichi Uemura | 1982-03-30 |