| Business | Phone |
| Respec Engineering 3824 Jet Dr, Rapid City 57703 | (605) 394-6400 |
| Intermountain Technical Svc 2204 Cruz Dr, Rapid City 57702 | (605) 348-5665 |
| Matrix Consulting Group Inc 2650 Jackson Blvd, Rapid City 57702 | (605) 399-2000 |
| Maxim Technologies Inc 330 Knollwood Dr # B, Rapid City 57701 | (605) 348-5850 |