1. APS Technology Inc.
2. Baker Hughes Company
3. Compass Directional Guidance Inc.
4. D-Tech Rotary Steerable
5. Enteq Upstream PLC
6. Gyrodata
7. Halliburton Energy Services Inc.
8. Huisman Equipment B.V.
9. HXR Drilling Services
10. NOV Inc.
11. Schlumberger Ltd.
12. Scientific Drilling International
13. Turbo Drill Industries Inc.
14. Weatherford International PLC
15. Xi’an SenNav Electronic Technology Co. Ltd.