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