Tools and Machinery
| Fri 15 May 2026
Beijing, May 16 -- Chengdu Aircraft Industry Group has submitted a patent application for Double-tip-angle Drill Bit Design Method, Double-tip-angle Drill Bit, Device, Medium and Equipment. This invention was developed by Guo Jiurong, Chen Jie, Song Ge, Huang Mingcong, Shi Jialin, Ma Fei, Gao Jinkun, Zhang Yang, Zhang Yunzhao an..