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Beijing Sanki Petroleum Technology Co., Ltd.
Zhejiang Shengxing Petroleum Equipment Co., Ltd.
Wenzhou Bluesky Energy Technology Co., Ltd.
Hangzhou ChengYingYi Energy Technology Co., Ltd.
Hebei Lifu Pipeline Tech Co., Ltd.
Dinggin Hardware (Dalian) Co., Ltd.
Senpai Machinery Co., Ltd.
Guangzhou Yoko Electron Co., Ltd.