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HUASHENG PIPELINE TECHNOLOGY CO., LTD.
Qingdao Kingway Industries Co., Ltd.
Qingdao Bestflow Industrial Co., Ltd.
Yuyao Hydraulics Tube Co., Ltd.
Wenzhou Yuzheng Valve Co., Ltd.
Wenzhou JiuEn NC Mechanical Valve Co., Ltd.
Hopewell Building Materials Co., Ltd.
Hebei Shengtian Pipe-Fitting Group Co., Ltd.