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