Construction
| Fri 14 Nov 2025
Beijing, Nov. 14 -- State Intellectual Property Office of China has awarded a patent to Hunan Qiyan Zhuchuang Engineering Tech Co Ltd for Bottom Expanding Device and Precast Pile. Xiang Xianglin, Yin Xijun, Zhang Wei, Guo Guliang, Tan Guangyu, Peng Baixing, Tang Xuhe, Cao Jiao, Xiao Jie, Zhao Lei, Fu Xiang, Wu Qifang and Fang Sh..