Metal & Mining
| Thu 21 Nov 2024
Beijing, Nov. 21 -- Sanmenxia Longwangzhuang Coal Ind has been granted a patent for mining air door locking system. This invention was developed by Lyu Jianli, Sun Lei, Wang Jiang, Gu Chaojun, Peng Tao, Huang Runlong, Lu Zhengyang, Li Shengnan, Liu Chuanxiang, Li Gang, Mao Haoduo, Song Shaodong, Yuan Linqing, Su Dongyi and Fan M..