| Business | Phone |
| Hills Drafting Svc 360 Table Mountain Blvd, Oroville 95965 | (530) 532-0850 |
| Monte J Pratt Design 5280 Lower Wyandotte Rd, Oroville 95966 | (530) 533-0487 |
| Bill Sumner 5 Madrone Ave # C, Oroville 95966 | (530) 532-1164 |
| Tecton Enterprises 1970 Mitchell Ave # C, Oroville 95966 | (530) 533-4501 |