| Business | Phone |
| Ambriel Communications Inc Po Box 26918, Baltimore 21212 | (410) 433-1030 |
| Residential Telephone Wiring Baltimore 21214 | (410) 254-4844 |
| Stout Communications 6400 Frankford Ave # 5, Baltimore 21206 | (410) 732-1155 |
| Techni Site 1335 Riverwood Way, Baltimore 21226 | (410) 439-0013 |