Tools and Machinery
| Thu 11 Jun 2026
Beijing, June 12 -- Ningbo Iron & Steel has sought patent for Shaft Double Key Groove Machining Method and Key Groove Machining Device. This invention was developed by Yang Linwan, Li Jianhong, Chen Guoqiang, Yuan Chun'an, Zhu Zhisheng, Zhang Keli, Yang Mingqing, Zhang Yun, Jin Jian, Ma Guangde, Huang Xueming, Lyu Yang, Zhang Ya..