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Shaanxi Aipu Machinery Manufacture Co., Ltd.
Beijing Superior Drilling Equipment Co., Ltd.
Jianhu Jielin Petrochemical Machinery Co., Ltd.
Puyang Zhongshi Group Co., Ltd.
Shenyang New Densen Casting and Forging Co., Ltd.
OASIS OIL TOOLS CO., LTD.
Cangzhou Lockheed Petroleum Machinery Co., Ltd.
Nanchang Bestway Cemented Carbide Co., Ltd.
Jiangyin Shuangma Heavy Industry Equipment Co., Ltd.