Security & Protection
| Fri 25 Sep 2026
Beijing, Sept. 25 -- Yankuang Energy Group has been granted a patent for Mining Waterproof and Fireproof Air-tight Door. Zhang Huasheng, Xu Chuanliang, Pan Xingbo, Fan Hongchang, Liu Chao, Zhang Shouduo, Zheng Feng, Zhang Fujian, Ren Qiusheng, Wang Shukun, Liu Ning, Jiang Lishan, Gao Cunyi, Cai You and Gao Lei developed the inve..