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