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Shenzhen Jingzuan Precision Hardware & Tools Co., Ltd.
Shenzhen Zhenxing Metal Manufacturing Co., Ltd.
Beijing Superior Drilling Equipment Co., Ltd.
Chance Door International Co., Ltd.
Cangzhou Lockheed Petroleum Machinery Co., Ltd.
Handan Zhongye Machinery Manufacture Co., Ltd.
Jinan Xinyu Cemented Carbide Co., Ltd.
OASIS OIL TOOLS CO., LTD.
Chengdu Derbo Steel Co., Ltd.
Puyang Zhongshi Group Co., Ltd.
Xiamen Prodrill Equipment Co., Ltd.
Qingdao Kinglonda Rubber & Plastics Technology Co.,Ltd