| Business | Phone |
| Avid Associates 1515 Grace Church Rd, Silver Spring 20910 | (301) 879-7322 |
| Behr Enterprises Intl 14835 Melfordshire Way, Silver Spring 20906 | (301) 598-6878 |
| Soc Assoc Inc 1751 Elton Rd # 210, Silver Spring 20903 | (301) 439-3200 |
| Scientific Systems Sales Corp 11141 Georgia Ave # 519, Silver Spring 20902 | (301) 933-1670 |
| Robb Associates Inc Silver Spring 20906 | (301) 871-0299 |
| Pollock & Guy Assoc Inc 12006 Remington Dr, Silver Spring 20902 | (301) 622-6710 |
| Patton Associate Inc 4019 Rickover Rd, Silver Spring 20902 | (301) 982-6464 |
| Envoy Sales Group Ltd 12105 Kerwood Rd, Silver Spring 20904 | (301) 622-4329 |
| H R Sieber Sales Engineers 10111 Colesville Rd # 121, Silver Spring 20901 | (301) 214-2221 |
| Highlands Group 1738 Elton Rd # 304, Silver Spring 20903 | (301) 408-0600 |