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Puyang Zhongshi Group Co., Ltd.
Cangzhou Lockheed Petroleum Machinery Co., Ltd.
Ji Ning Hengwang Mining Machinery Co., Ltd.
Beijing Superior Drilling Equipment Co., Ltd.
Shaanxi Aipu Machinery Manufacture Co., Ltd.
Jiangyin Shuangma Heavy Industry Equipment Co., Ltd.
Jianhu Jielin Petrochemical Machinery Co., Ltd.
Chance Door International Co., Ltd.