Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11021954 | Method of recovering room-and-pillar coal pillar by using external replacement supports | Nan Zhou, Hengfeng Liu, Meng Li, Jixiong Zhang | 2021-06-01 |
| 10895154 | Base mechanism of single prop capable of being unloaded at reduced pressure | Qiang Zhang, Jixiong Zhang, Wenyue Qi, Hong YAN, Meng Li | 2021-01-19 |