Security & Protection
| Fri 10 Apr 2026
Beijing, April 11 -- Explor Engineering Department Of Pingdingshan Tianan Coal Mining Co Ltd has obtained a patent for anti-lag spray hole bearing sealing type security cover. This invention was developed by Wen Pengpeng, Meng Zhancheng, Zhang Yimin, Xing Wanpeng, Wang Qixiang, Ju Bingbing, Qi Hongwei, Sun Shuai, Ma Shuaihui and..