1. Archer Ltd.
2. Asian Oilfield Services Limited
3. Baker Hughes Company
4. Barbco Inc.
5. Bench Tree
6. Cathedral Energy Services Ltd.
7. China Oilfield Services Limited
8. Cougar Drilling Solutions
9. Creighton Rock Drill Ltd.
10. Directional Drilling Services Inc.
11. EXALO DRILLING S.A.
12. General Electric Company
13. Gyrodata Incorporated
14. Halliburton Company
15. Herrenknecht AG
16. Jindal Drilling & Industries Limited
17. LEAM Drilling Systems Inc.
18. Nabors Industries Ltd.
19. NOV Inc.
20. Phoenix Technology Services
21. Precision Drilling Corporation
22. Schlumberger Limited
23. Scientific Drilling International Inc.
24. Valiant Energy Service
25. Vertex Downhole Ltd.
26. Weatherford International PLC