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