| Business | Phone |
| Discount Plotter Supplies 4001 Holly St # 17, Denver 80216 | (303) 399-7568 |
| Western Drafting Furniture 4001 Holly St # 17, Denver 80216 | (303) 355-2505 |
| Indel-Davis 4770 Fox St # 11, Denver 80216 | (303) 292-1525 |
| Spectrum Data Products Inc 2475 W 2nd Ave # 30, Denver 80223 | (303) 922-6600 |