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Beijing Superior Drilling Equipment Co., Ltd.
Changsha Miracleland Import & Export Co., Ltd.
Hebei Hollyland Co., Ltd.
Jinan Xinyu Cemented Carbide Co., Ltd.
Shenzhen Zhenxing Metal Manufacturing Co., Ltd.
Zhuzhou Jinding Cemented Carbide Co., Ltd.
Xiamen Prodrill Equipment Co., Ltd.
Xi'an Tosilon Automation Co., Ltd.
Puyang Zhongshi Group Co., Ltd.
Cangzhou Lockheed Petroleum Machinery Co., Ltd.