| Business | Phone |
| Analog Interface 3810 Ne 120th St, Seattle 98125 | (206) 440-5758 |
| Capp Inc 10700 Meridian Ave N G10, Seattle 98133 | (206) 624-8787 |
| Control Contractors Inc 1128 Poplar Pl S, Seattle 98144 | (206) 328-1730 |
| Crown Controls Inc 655 Ne Northlake Pl, Seattle 98105 | (206) 632-8503 |
| G Controls 10734 Lake City Way Ne, Seattle 98125 | (206) 363-4863 |
| Hoffman Instrumentation Supply 2411 W Lynn St, Seattle 98199 | (425) 255-6616 |
| Honeywell 9707 45th Ave Ne, Seattle 98115 | (206) 523-0586 |