Transportation
| Sat 29 Nov 2025
Beijing, Nov. 29 -- China MCC17 Group has submitted a patent application for Low-clearance Rotary Drilling Rig and Method. This invention was developed by Wu Changguo, Huang Jinkun, Kim In-jae, Yin Wanyun, Cheng Anchun, Zhang Jiangong, Zhao Guohui, Rao Sixian, Yu Tongde, Wang Yixian, Luo Zhonglong, Fang Qian, Wang Lei, Zhang Zha..