| S.no | Company Name | Founded | Country |
|---|---|---|---|
| 1 | Motor Protection Electronics (MPE) | USA | |
| 2 | KROHNE Inc. | USA | |
| 3 | APT Instruments | USA | |
| 4 | Siemens Corporation | USA | |
| 5 | AMETEK Drexelbrook | USA | |
| 6 | Macromatic Industrial Controls Inc. | USA | |
| 7 | R-K Electronics Inc. | USA | |
| 8 | Innovative Components | USA | |
| 9 | Hasco Relays & Electronics International Corp. | USA | |
| 10 | Gems Sensors & Controls | USA | |
| 11 | Sylvania | USA | |
| 12 | PICS INC | USA | |
| 13 | Harwil | USA | |
| 14 | SUNS International | USA | |
| 15 | Vynckier Enclosure Systems Inc. | USA | |
| 16 | Princo Instruments Inc. | USA | |
| 17 | Liquid Measurement & Controls Inc. | USA | |
| 18 | HBcontrols Inc. | USA |
