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Senpai Machinery Co., Ltd.
Wenzhou Bluesky Energy Technology Co., Ltd.
Zhejiang Shengxing Petroleum Equipment Co., Ltd.
Hebei Lifu Pipeline Tech Co., Ltd.
Sichuan Mayflower Precision Machinery Co., Ltd.
Hangzhou ChengYingYi Energy Technology Co., Ltd.
CLW Heavy Industry Co., Ltd.
Dinggin Hardware (Dalian) Co., Ltd.