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Puyang Zhongshi Group Co., Ltd.
Shaanxi Aipu Machinery Manufacture Co., Ltd.
Zibo Qingdong Machinery Manufacturing Co., Ltd.
OASIS OIL TOOLS CO., LTD.
Nanchang Bestway Cemented Carbide Co., Ltd.
Chance Door International Co., Ltd.
Jiangyin Shuangma Heavy Industry Equipment Co., Ltd.
Beijing Superior Drilling Equipment Co., Ltd.