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