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