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