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