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