| Business | Phone |
| A To Z Tronics 1309 S Glendale Ave, Glendale 91205 | (818) 246-6616 |
| Hi-Tech Electro Design 1554 Victory Blvd, Glendale 91201 | (818) 242-4228 |
| Command Security Systems 131 S Orange St, Glendale 91204 | (818) 246-3071 |
| Powertron Co Glendale 91204 | (818) 246-2452 |
| Securecom Glendale 91204 | (818) 244-7766 |