Tools and Machinery
| Wed 22 Apr 2026
Beijing, April 22 -- China National Petroleum and CNPC Greatwall Drilling have applied Chinese patent for Drill Bit and Drilling Equipment. Sun Liwei, Luo Hua, Xia Boyi, Zhang Zhaofeng, Gao Qingchun, Ye Xi'an, Ma Yong, Huang Kuilin, Wang Lei, Xia Yu, Huo Aili, Jiao Yang, Zhong Yong, Wang Jian, Yang Shangjun, Yan Shibang, Su Xu a..