Security & Protection
| Thu 24 Sep 2026
Beijing, Sept. 24 -- Chinese Patent for Large-caliber Gas Box for Mine Rescue Drilling has been issued to Hebei Shitan Machinery Manufacturing. This invention was developed by Duan Weijie, Zhang Qiang, Xie Yi, Yue Shipeng, Qin Yining, Yan Chong, Man Guoxiang, Wang Kehu, Yang Heguo, Kong Linghu and Yan Chenghao.
The patent appli..