Security & Protection
| Mon 29 Jun 2026
Beijing, June 29 -- Shandong Zhonghao Holdings Group has submitted a patent application for Batch Welding Device for Accessories for Protective Door. Wei Guangsheng, Yu Chenyi, Bai Hua, Zhang Yi, Li Xiyu, Chen Liyong, Wang Zhaoyu, Xing Yangang, Zhang Chunhua, Ma Runtian, Liu Gang and Wang Fang developed the invention.
The paten..