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Beijing Superior Drilling Equipment Co., Ltd.
Zibo Qingdong Machinery Manufacturing Co., Ltd.
Shaanxi Aipu Machinery Manufacture Co., Ltd.
Puyang Zhongshi Group Co., Ltd.
Nanchang Bestway Cemented Carbide Co., Ltd.
Cangzhou Lockheed Petroleum Machinery Co., Ltd.
Jiangyin Shuangma Heavy Industry Equipment Co., Ltd.
Jianhu Jielin Petrochemical Machinery Co., Ltd.