Tools and Machinery
| Thu 29 Jan 2026
Beijing, Jan. 29 -- Shanxi Shanmei Guoyuan Coal Mine Safety Tech Co Ltd has applied Chinese patent for Layered Cutting and Drilling Method and Drilling Tool for Soft Coal Seam. Jiang Zhang, Ren Yunfeng, Hao Ruiyun, Guo Qing, Liu Yezhong, Wei Suqing, Yao Jian, Liang Zhigang, Hu Yaning, Zhao Qi, Tian Feng, Yang Yang, Xu Min, Yang ..