Issued Patents All Time
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6431075 | Center-cut method for tunnel excavation utilizing large unloaded blast holes and a circular pre-split | Dong Soo Shim, Young Dong Cho | 2002-08-13 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6431075 | Center-cut method for tunnel excavation utilizing large unloaded blast holes and a circular pre-split | Dong Soo Shim, Young Dong Cho | 2002-08-13 |