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Beijing Sanki Petroleum Technology Co., Ltd.
Dinggin Hardware (Dalian) Co., Ltd.
Senpai Machinery Co., Ltd.
Sichuan Mayflower Precision Machinery Co., Ltd.
Hangzhou ChengYingYi Energy Technology Co., Ltd.
CLW Heavy Industry Co., Ltd.
Zhejiang Shengxing Petroleum Equipment Co., Ltd.
Shenyang Aerospace Xinyang Mechanical and Electrical Co., Ltd.