Issued Patents 2021
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11021954 | Method of recovering room-and-pillar coal pillar by using external replacement supports | Nan Zhou, Meng Li, Zhongya Wu, Jixiong Zhang | 2021-06-01 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11021954 | Method of recovering room-and-pillar coal pillar by using external replacement supports | Nan Zhou, Meng Li, Zhongya Wu, Jixiong Zhang | 2021-06-01 |