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Puyang Zhongshi Group Co., Ltd.
Shaanxi Aipu Machinery Manufacture Co., Ltd.
Cangzhou Lockheed Petroleum Machinery Co., Ltd.
OASIS OIL TOOLS CO., LTD.
Zibo Qingdong Machinery Manufacturing Co., Ltd.
Beijing Superior Drilling Equipment Co., Ltd.
Nantong Yutung Industrial Co., Ltd.