| Business | Phone |
| Cadco Inc 5411 Old Frederick Rd # 1a, Baltimore 21229 | (410) 747-4001 |
| Patents Ink Inc 17 Warren Rd, Baltimore 21221 | (410) 484-5844 |
| Draftech 1636 E Baltimore St, Baltimore 21231 | (410) 675-8133 |
| Drafting Services 3401 S Hanover St, Baltimore 21225 | (410) 355-7712 |
| Personal Cadd Svc 6917 Richarts Ave, Baltimore 21244 | (410) 298-3713 |
| Superior Designs Construction Baltimore 21201 | (410) 761-1752 |