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