- 314 Associates
- Adaptive Digital Systems Inc
- AGM Electronics Inc
- Atn Signals Inc
- B & B Electromatic Inc
- Burrell Volunteer Fire Dept
- Burrell Welding
- Computerized Traffic Control
- Econolite Control Products Inc
- Econolite Control Products Inc
- Eva Signal Corp
- Federal Signal Community Wrnng
- Fire & Nurses Call Systems Inc
- International Traffic Systems
- Lee Electric Inc
- Metra Metropolitan Rail
- Pac Atlantic Corp
- Road Safe Signs & Sup
- Scully Signal Co
- Sign Design
- Signal Source
- Timeomatic
- Union Switch & Signal
- Wheelock Inc
- Xtreme Graffix & Design