Metal & Mining
| Wed 26 Aug 2026
Beijing, Aug. 26 -- State Intellectual Property Office of China has awarded a patent to Ningxia Hui Autonomous Region Coal Geology Bureau for Coal Mine Drilling Negative Pressure Monitoring Device. Li Gang, Ma Kai, Zhu Jin, Liang Yongping, Wang Bei, He Wei, Wang Wenqing, Niu Guobin, Wang Gaohao, Men Peng, Li Xian, Niu Jiankui an..