| Business | Phone |
| Electronics Development Corp 9055 Guilford Rd # F, Columbia 21046 | (301) 596-7000 |
| General Dynamics Corp 8975 Guilford Rd # 100, Columbia 21046 | (410) 381-5080 |
| Microwave Telemetry Inc 8835 Columbia 100 Pkwy # K-L, Columbia 21045 | (410) 715-5292 |
| Mykotronx Inc 9841 Brokenland Pkwy # 212, Columbia 21046 | (410) 290-5730 |