Petrochemicals
| Fri 17 Apr 2026
Beijing, April 17 -- Zhejiang Jieli Petrochemical Equipment Co Ltd has obtained a patent for pressure relief manhole capable of adjusting opening degree. This invention was developed by Li Guofei, Zhu Feng, Gao Changjun, Zhang Zheyang, He Yonggang, Gao Gaimiao, Li Bisheng, Zhu Gentuo and Li Xuantong.
The patent application nu..