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Shaanxi Aipu Machinery Manufacture Co., Ltd.
Jianhu Jielin Petrochemical Machinery Co., Ltd.
Puyang Zhongshi Group Co., Ltd.
Zibo Qingdong Machinery Manufacturing Co., Ltd.
Shenyang New Densen Casting and Forging Co., Ltd.
Jiangyin Shuangma Heavy Industry Equipment Co., Ltd.
OASIS OIL TOOLS CO., LTD.
Beijing Superior Drilling Equipment Co., Ltd.
Cangzhou Lockheed Petroleum Machinery Co., Ltd.