| Business | Phone |
| Protectal Telcom Systems Po Box 1108, West Covina 91793 | (626) 967-9448 |
| Advance Security Assistance 1815 E Workman Ave, West Covina 91791 | (626) 915-5151 |
| Am-Tec Security 625 S Shasta St, West Covina 91791 | (626) 332-6193 |
| Cor Systems 1428 E Merced Ave, West Covina 91791 | (626) 919-0019 |
| L P Concepts 2648 E Workman Ave # 223, West Covina 91791 | (626) 917-0978 |