| Business | Phone |
| Big Tex Security Systems 811 S Central Expy # 533, Richardson 75080 | (972) 669-2277 |
| Chubb Security Systems Inc 903 N Bowser Rd 250, Richardson 75081 | (972) 690-4691 |
| Greater Dallas Enterprises Inc Richardson 75080 | (972) 783-4334 |
| Isi Security Systems 254 E Arapaho Rd 180, Richardson 75081 | (972) 680-8025 |
| On-Guard Security Systems 1819 Firman Dr 121, Richardson 75081 | (972) 437-6278 |
| Spear Security 1220 Nantucket Dr, Richardson 75080 | (972) 661-1243 |
| Top Communication Inc 506 N Central Expy, Richardson 75080 | (972) 231-7777 |
| Vidtex Systems Inc 1201 Richardson Dr 115, Richardson 75080 | (972) 238-8832 |
| J T Lock & Key Po Box 851144, Richardson 75085 | (972) 644-3382 |