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