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In May 2025, Nanjing Qijun obtained the patent for anti-loosening locking nuts and their processing technology

Information from the State Intellectual Property Office shows that Nanjing Qijun Transportation Equipment Co., Ltd. has

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In July 2025, Nanjing Qijun obtained the positioning end wedge bolt technology, which is convenient for installation and connection to be more secure.

Information from the State Intellectual Property Office shows that Nanjing Qijun Transportation Equipment Co., Ltd. has

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