1. 3W International Gmbh
2. Caterpillar Inc.
3. China Yuchai International Ltd.
4. Clarke Energy
5. Cummins Inc.
6. Deutz Ag
7. Dresser Rand Group Inc.
8. Doosan Infracore Co. Ltd.
9. Fairbanks Morse Engines
10. General Electric Company (Inio)
11. Hyundai Heavy Industries Co. Ltd.
12. Ihi Corporation
13. Kawasaki Heavy Industries Ltd.
14. Man Se
15. Mitsubishi Heavy Industries Inc.
16. W?rtsil? Corporation
17. Rolls Royce Holdings Plc.
18. Yanmar Co. Ltd.