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