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| Tue 30 Jun 2026
Beijing, June 30 -- Sichuan Chengyu Expressway Co Ltd and Sichuan Chengle Expressway Co Ltd have filed a patent application for Signboard Content Replacement Mechanism. This invention was developed by Yue Jianhong, Zhang Yifan, Huang Zhaochao, Xu Jinhua, Zeng Hui, Wu Wenqi, Peng Chi, He Yongxin, He Qiongfen, Zhang Xianjun, Zhang..