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