| S.no | Company Name | Founded | Country |
|---|---|---|---|
| 1 | Jewell Instruments LLC | USA | |
| 2 | Simpson Electric Co. | USA | |
| 3 | SE Relays | USA | |
| 4 | Flex-Core | USA | |
| 5 | Weschler Instruments – Div. of Hughes Corp. | USA | |
| 6 | General Electric Co. | USA | |
| 7 | Madison Electric Products Inc. | USA | |
| 8 | LFE/API Meters | USA | |
| 9 | Johnson Electric | USA | |
| 10 | Electro Numerics Inc. | USA | |
| 11 | PICS INC | USA | |
| 12 | TE Connectivity | USA | |
| 13 | Non-Linear Systems | USA | |
| 14 | ISE Inc. | USA | |
| 15 | Power True Systems Corp. | USA | |
| 16 | Texmate Inc. | USA | |
| 17 | Basler Electric Co. | USA | |
| 18 | American Zettler Inc. | USA | |
| 19 | Hoyt Electrical Instrument Works Inc. | USA | |
| 20 | Encorp LLC | USA | |
| 21 | WPI | USA |
