- TianJian FengShengDa Battery Co., Ltd
- lithium-thionyl chloride battery, mwd battery.
- Address:Tianjin, Tianjin, China
- Machtec (Tianjin) Petroleum Equipment Co.,Ltd
- Solid Control, Downhole Motors, Shaker screen, MWD.
- Address:Gusheng Road 20#,jinbin Industrial Park,Wuqing,Tianjin Tianjin, Tianji
- Beijing HTWB Petroleum Technology Co., Ltd
- MWD, LWD, directional drilling, drilling.
- Address:1F, Building 3, No.8, chuangye road, haidian district Beijing, Beijing