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Puyang Zhongshi Group Co., Ltd.
Zibo Qingdong Machinery Manufacturing Co., Ltd.
Shaanxi Aipu Machinery Manufacture Co., Ltd.
Cangzhou Lockheed Petroleum Machinery Co., Ltd.
OASIS OIL TOOLS CO., LTD.
Beijing Superior Drilling Equipment Co., Ltd.
Ji Ning Hengwang Mining Machinery Co., Ltd.
Jianhu Jielin Petrochemical Machinery Co., Ltd.