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Ji Ning Hengwang Mining Machinery Co., Ltd.
Puyang Zhongshi Group Co., Ltd.
Shaanxi Aipu Machinery Manufacture Co., Ltd.
Zibo Qingdong Machinery Manufacturing Co., Ltd.
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Beijing Superior Drilling Equipment Co., Ltd.
OASIS OIL TOOLS CO., LTD.
Shenyang New Densen Casting and Forging Co., Ltd.