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Senpai Machinery Co., Ltd.
Sichuan Mayflower Precision Machinery Co., Ltd.
CLW Heavy Industry Co., Ltd.
Wenzhou Bluesky Energy Technology Co., Ltd.
Shenyang Aerospace Xinyang Mechanical and Electrical Co., Ltd.
Hangzhou ChengYingYi Energy Technology Co., Ltd.
Beijing Sanki Petroleum Technology Co., Ltd.
Yongjia Aocheng Hardware Co., Ltd.
Zhejiang Shengxing Petroleum Equipment Co., Ltd.