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Beijing Superior Drilling Equipment Co., Ltd.
Yantai Petroleum Machinery Co., Ltd.
Cangzhou Lockheed Petroleum Machinery Co., Ltd.
Jianhu Jielin Petrochemical Machinery Co., Ltd.
Shaanxi Aipu Machinery Manufacture Co., Ltd.
Ji Ning Hengwang Mining Machinery Co., Ltd.
Yancheng Jikai Petroleum Machinery Co., Ltd.
Nanchang Bestway Cemented Carbide Co., Ltd.