Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4971157 | Apparatus for the removal of spoil when making trenches of great depth | Karl Bollinger, Philippe Chagnot | 1990-11-20 |
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4971157 | Apparatus for the removal of spoil when making trenches of great depth | Karl Bollinger, Philippe Chagnot | 1990-11-20 |