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Beijing Sanki Petroleum Technology Co., Ltd.
Wenzhou Bluesky Energy Technology Co., Ltd.
Zhejiang Shengxing Petroleum Equipment Co., Ltd.
Dongxing Lianyou Import & Export Co., Ltd.
Senpai Machinery Co., Ltd.
Hangzhou ChengYingYi Energy Technology Co., Ltd.
Sichuan Mayflower Precision Machinery Co., Ltd.
Dinggin Hardware (Dalian) Co., Ltd.