| Business | Phone |
| Electro-Mechanisms 515 W Allen Ave # 15, San Dimas 91773 | (909) 394-9953 |
| Walters Wholesale Electric 357 E Arrow Hwy, San Dimas 91773 | (909) 450-0840 |
| Spectrum Instruments Inc 570 E Arrow Hwy, San Dimas 91773 | (909) 971-9710 |
| Secure Link Corp 403 E Arrow Hwy, San Dimas 91773 | (909) 599-7232 |
| Selecta Switch 570 E Arrow Hwy # C, San Dimas 91773 | (909) 394-1788 |