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| Fri 14 Nov 2025
Beijing, Nov. 15 -- State Intellectual Property Office of China has awarded a patent to Zhejiang Huadong Photoelectric Instr Co Ltd for Easy-to-adjust Two-axis Spirit Level. Xue Wenhui, Zhang Xinquan, Yang Juheng, Zhang Hong, Zhou Jing, Mao Letian, Zhou Chao, Sun Feiyu, Zhu Pan, Zhang Fan, Tian Jianfeng and Yang Bin developed th..