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| Square D - North American Division of Schneider Electric 1415 South Roselle Road - Palatine, IL 60067 USA - - | |
| Edwards Signaling Products 90 Fieldstone Court - Cheshire, CT 06410-1212 USA - - | ||
| Norstat, Inc. | ||
| Federal Signal Corporation | ||
| Edwards Signaling Products 90 Fieldstone Court - Cheshire, CT 06410-1212 USA - - | ||
| D.G. Controls Limited | ||
| Tomar Electronics | ||
| SoLiCo 75 Locust Street - Hartford, CT 06114 USA - - | ||
| Patlite Corp. | ||
| GE General Electric Industrial Systems Division - - - | ||
| Control Concepts | ||
| Federal Signal Corporation | ||
| EE Controls (Electrical & Electronic Controls) | ||
| Arcolectric Corporation | ||
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