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