Adapter for adapting fire hoses with different specifications of threaded connectors von ZHU CHENGJIE, HUANG JIANLONG, YANG GUANGYUAN, WANG BEI, WANG KAIPING, ZHAO SHUYU, HAN XIAOYONG, SU GUANGBIN, CHEN JIE, WANG JIAN, OU HUANCHANG, LI TIANFU, WANG ZHISHAN, QI CHENGCHENG, WANG CHANGZHENG, LI QILONG, GU DEXIU

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