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Chengdu Huyuan Dafei Co., Ltd
Zibo Qingdong Machinery Manufacturing Co., Ltd.
Beijing Superior Drilling Equipment Co., Ltd.
Puyang Zhongshi Group Co., Ltd.
Ji Ning Hengwang Mining Machinery Co., Ltd.
Chance Door International Co., Ltd.
Cangzhou Lockheed Petroleum Machinery Co., Ltd.
Shaanxi Aipu Machinery Manufacture Co., Ltd.
Jiangyin Shuangma Heavy Industry Equipment Co., Ltd.