| S.no | Company Name | Founded | Country |
|---|---|---|---|
| 1 | Dyno One Inc. | USA | |
| 2 | COSA Xentaur Corp. | USA | |
| 3 | MAHA USA LLC | USA | |
| 4 | Power Test Dynamometers | USA | |
| 5 | Sakor Technologies Inc. | USA | |
| 6 | Emission Systems Inc. | USA | |
| 7 | Com-Power Corp. | USA | |
| 8 | Dyne Systems | USA | |
| 9 | Hickok Inc. | USA | |
| 10 | Paul N. Gardner Co. Inc. | USA | |
| 11 | Analytical Process Systems | USA | |
| 12 | Climatic Testing Systems Inc. | USA | |
| 13 | Vortab Company | USA | |
| 14 | Mustang Dynamometer / Mustang Engineering | USA | |
| 15 | Red Mountain Engineering | USA | |
| 16 | Digital Wave Corp. | USA | |
| 17 | Webber Engineering & Manufacturing Inc. | USA | |
| 18 | Q Corporation | USA | |
| 19 | Blanke Industries Inc. | USA | |
| 20 | California Analytical Instruments Inc. | USA | |
| 21 | Pierburg Instruments Inc. | USA |
