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Ji Ning Hengwang Mining Machinery Co., Ltd.
Puyang Zhongshi Group Co., Ltd.
Cangzhou Lockheed Petroleum Machinery Co., Ltd.
OASIS OIL TOOLS CO., LTD.
Shaanxi Aipu Machinery Manufacture Co., Ltd.
Jianhu Jielin Petrochemical Machinery Co., Ltd.
Shenyang New Densen Casting and Forging Co., Ltd.