- Shanxi Weigao Petroleum Drilling Tools Co.,Ltd.
- Address:Songzhuang Industrial Zone Taiyuan Shanxi China
- Zhengzhou Kefid Machinery Co.,Ltd
- Address:No.169,Kexue Avenue,High-tech Development Area,Zhengzhou,China Zhengzhou Henan 450001 China
- Shanghai Leiyou Complete Machinenary Co., Ltd.
- Address:585 Gongye Road, Jinhui Town, Fengxian District, Shanghai, China Shanghai Shanghai 201404 China