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