Issued Patents 2021
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11199091 | Cageway connecting device and connecting method thereof | Qiang Qin, Hongxin Yan, Qingyong Du, Jianguo Ding | 2021-12-14 |
| 10988347 | Large-tonnage coal dropping buffer skip for mine | Yuxing Peng, Zhencai Zhu, Gongbo Zhou, Qingyong Du, Hao Lu +3 more | 2021-04-27 |