| S.no | Company Name | Founded | Country |
|---|---|---|---|
| 1 | Barbour Stockwell Inc. | USA | |
| 2 | Siemens Corporation | USA | |
| 3 | J. F. Mullen Co. Inc. | USA | |
| 4 | Sylvania | USA | |
| 5 | Test Devices by SCHENCK | USA | |
| 6 | Air Turbine Technology Inc. | USA | |
| 7 | H & H Manufacturing Co. Inc. | USA | |
| 8 | Jaycraft Corp. | USA | |
| 9 | Conhagen Industries | USA | |
| 10 | Power Phase LLC | USA | |
| 11 | Windham Machine Co. Inc. | USA |
