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| Tue 30 Jun 2026
Beijing, June 30 -- Laizhou City Toppower Petroleum Machinery Co Ltd has sought patent for Sucker Rod Elevator Device. This invention was developed by Dong Weiguo, Tang Junyao, Yang Runqian, Jiang Jianguang, Han Yanlin, Ma Wei, Wang Jianyu, Sun Bin, Yu Qun, Jiang Wenqi, Sun Jing and Wang Weijian.
The patent application number..