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Beijing Sanki Petroleum Technology Co., Ltd.
Senpai Machinery Co., Ltd.
Wenzhou Bluesky Energy Technology Co., Ltd.
Zhejiang Shengxing Petroleum Equipment Co., Ltd.
Hebei Lifu Pipeline Tech Co., Ltd.
Shenyang Aerospace Xinyang Mechanical and Electrical Co., Ltd.
Sichuan Mayflower Precision Machinery Co., Ltd.
Dinggin Hardware (Dalian) Co., Ltd.