| Business | Phone |
| Bg Secretarial Svc Po Box 5151, Concord 94524 | (925) 427-5777 |
| Expert Motor Control 2219 Greenbrier St, Concord 94520 | (925) 609-9557 |
| Klemushkin Services Po Box 21610, Concord 94521 | (925) 825-4694 |
| Mab Svc 4012 Joyce Dr, Concord 94521 | (925) 686-1703 |
| Telcom Services Inc 2045 Mount Diablo St, Concord 94520 | (925) 602-5150 |