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Hopewell Building Materials Co., Ltd.
Hebei Shengtian Pipe-Fitting Group Co., Ltd.
Qingdao Bestflow Industrial Co., Ltd.
Yuyao Hydraulics Tube Co., Ltd.
Qingdao Hexin Machinery Co., Ltd.
Qingdao Kingway Industries Co., Ltd.
HUASHENG PIPELINE TECHNOLOGY CO., LTD.