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Cangzhou Wanxiangtong Steel Pipe Co. Ltd
Tianjin Yuantai Derun Pipe-Making Group Co., Ltd
Zhejiang Business Union Import and Export Co. Ltd
Shanghai Huachuang Steel Industry Co., Ltd
Guangdong Walsall Steel Pipe Industrial Co., Ltd.
Chengdu Derbo Steel Co., Ltd.
Hengshui Qijia Engineering Material Co. Ltd
Tianjin Juncheng Yahe International Trade Co. Ltd
Shanghai Steehill Industry Group Co. Ltd
Tianjin Youfa International Trade Co. Ltd
Sino Sources Tech Co. Ltd
Shanxi Solid Industrial Co.,Ltd.
Tianjin Anxintongda Steel Pipe Co. Ltd