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Hebei Lifu Pipeline Tech Co., Ltd.
Beijing Sanki Petroleum Technology Co., Ltd.
Shenyang Aerospace Xinyang Mechanical and Electrical Co., Ltd.
Senpai Machinery Co., Ltd.
Wenzhou Bluesky Energy Technology Co., Ltd.
Zhejiang Shengxing Petroleum Equipment Co., Ltd.
Dongxing Lianyou Import & Export Co., Ltd.
SICHUAN NEW TIANYUAN TECHNOLOGIES CO., LTD.
Dinggin Hardware (Dalian) Co., Ltd.