Issued Patents 2002
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6499406 | Blasting apparatus for forming horizontal underground cavities and blasting method using the same | — | 2002-12-31 |
| 6431075 | Center-cut method for tunnel excavation utilizing large unloaded blast holes and a circular pre-split | Han Uk Lim, Young Dong Cho | 2002-08-13 |