Security & Protection
| Sat 12 Jul 2025
Beijing, July 12 -- State Intellectual Property Office of China has awarded a patent to Baotou Iron and Steel Group for self-locking door lock device. Zhao Jianqiang, Zeng Yongjie, Bai Wei, Chang Wen, Dong Junmin, Deng Jianlin, Liu Haibo, Wang Jianhua, Jiang Lifeng, Ma Qinwei, Fang Ke, He Xuran, Huang Yufeng, Wang Chen, Wang Lia..