| Business | Phone |
| Alpha Electronic Systems 2410 Webster St, Oakland 94612 | (925) 377-9900 |
| Alpha Electronic Systems 576 W Grand Ave, Oakland 94612 | (510) 832-4200 |
| H C & C Communications Oakland 94611 | (510) 655-1193 |
| Service Innovations Computers 2710 Macarthur Blvd, Oakland 94602 | (510) 530-0204 |