| S.no | Company Name | Founded | Country |
|---|---|---|---|
| 1 | Cit Relay & Switch | USA | |
| 2 | Struthers-Dunn Inc. | USA | |
| 3 | Littelfuse Inc. | USA | |
| 4 | SE Relays | USA | |
| 5 | Contrex Inc. | USA | |
| 6 | TE Connectivity | USA | |
| 7 | Omntec Manufacturing | USA | |
| 8 | Fairchild Industrial Products a Rotork Instruments company | USA | |
| 9 | NTE Electronics Inc. | USA | |
| 10 | Hasco Relays & Electronics International Corp. | USA | |
| 11 | Relay Service Co. | USA | |
| 12 | Picker Components Corp | USA | |
| 13 | Bender Inc. | USA | |
| 14 | American Zettler Inc. | USA | |
| 15 | Sky Electronics | USA | |
| 16 | Allied Controls Inc. | USA | |
| 17 | Control Engineering Inc. | USA | |
| 18 | Basler Electric Co. | USA | |
| 19 | Ward Leonard Electric Co. Inc. | USA |
