Enviornmental
| Mon 21 Sep 2026
Beijing, Sept. 21 -- Hunan Zhengding Environmental Tech Co Ltd has submitted a patent application for Closed Dust Removal Cleaning Device. Hou Jianzhong, Xu Jianjun, Liu Ruidong, Yang Baiwen, Liu Qingbo, Chen Jun, Wang Yucheng, Tang Xi, Tan Cuican, Li Jia and Chen Daijun developed the invention.
The patent application number ..