Metal & Mining
| Sat 29 Aug 2026
Beijing, Aug. 29 -- China Nat Coal Mining Equipment Co Ltd and Shijiazhuang Coal Mining Machinery have submitted a patent application for Rainproof Rotation Device and Rotation Operation Equipment. Guo Yutong, Zhou Zhaoxu, Liu Shuxia, Lee So-young, Wang Tianyang, Zhao Yangang, Wang Jian, Wang Suyi, Fan Haibo, Su Guanlan, Niu Zhi..