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