| Business | Phone |
| A B & T Sales 7905 Cessna Ave # A, Gaithersburg 20879 | (301) 948-8161 |
| Beaco Inc 951 Russell Ave # B, Gaithersburg 20879 | (301) 590-9512 |
| Steck Sales Co 7826 Beechcraft Ave, Gaithersburg 20879 | (301) 948-7502 |
| Roussil Associates Inc 26 Bell Bluff Ct, Gaithersburg 20879 | (301) 948-5518 |
| Network Products Inc 9157 Arbuckle Dr, Gaithersburg 20877 | (301) 548-0300 |
| Frazier Commercial Sales 23500 Rolling Fork Way, Gaithersburg 20882 | (301) 482-2277 |
| Mitchell Electric Sales 18903 Premiere Ct, Gaithersburg 20879 | (301) 670-0022 |
| Locust Marketing 18952 Bonanza Way, Gaithersburg 20879 | (301) 670-7002 |
| Instruments Specialists Inc 7881 Beechcraft Ave # H, Gaithersburg 20879 | (301) 208-0300 |
| Key Marketing Group Inc 8677 Grovemont Cir, Gaithersburg 20877 | (301) 258-8992 |