Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5380127 | Non-entry method of underground excavation in weak or water bearing grounds | Jean Narcy | 1995-01-10 |
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5380127 | Non-entry method of underground excavation in weak or water bearing grounds | Jean Narcy | 1995-01-10 |