Tools and Machinery
| Thu 30 Apr 2026
Beijing, April 30 -- Henan Polytechnic University has sought patent for Self-repairing Extraction Method for Regenerated Crack of Extraction Drill Hole. This invention was developed by Si Leilei, Zhao Tongyu, Wei Jianping, Liu Zhen, Liu Zhengdong, Wang Zhiming, Yao Banghua, Wen Zhihui, Sun Feiyang and Wu Kongzheng.
The patent..