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Zibo Qingdong Machinery Manufacturing Co., Ltd.
Shaanxi Aipu Machinery Manufacture Co., Ltd.
Puyang Zhongshi Group Co., Ltd.
Jianhu Jielin Petrochemical Machinery Co., Ltd.
Jiangyin Shuangma Heavy Industry Equipment Co., Ltd.
Cangzhou Lockheed Petroleum Machinery Co., Ltd.
OASIS OIL TOOLS CO., LTD.
Nanchang Bestway Cemented Carbide Co., Ltd.