Enviornmental
| Wed 20 Aug 2025
Beijing, Aug. 21 -- Yunnan Tongwei Gaochun Crystal Silicon has been granted a patent for Nitrogen Purification Device. This invention was developed by Liu Zhen, Peng Zhong, Li Zuoguo, Jiang Qingyun, Zhao Zhengang, Xiao Dong, Chen Yongchuan, Duan Wenlan, Chen Ruifang, Luo Jianping, Tian Hanfeng, Lu Huanping, Yan Yongqi and Li Rui..