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