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Puyang Zhongshi Group Co., Ltd.
Shenyang New Densen Casting and Forging Co., Ltd.
Shaanxi Aipu Machinery Manufacture Co., Ltd.
Zibo Qingdong Machinery Manufacturing Co., Ltd.
Cangzhou Lockheed Petroleum Machinery Co., Ltd.
Jianhu Jielin Petrochemical Machinery Co., Ltd.
OASIS OIL TOOLS CO., LTD.