| Business | Phone |
| Albertson Engineering 2040 W Main St, Rapid City 57702 | (605) 343-9606 |
| Parkside Design Inc 730 South St, Rapid City 57701 | (605) 348-9171 |
| Hermanson Egge Engineering Inc 2693 Commerce Rd # C, Rapid City 57702 | (605) 342-0680 |
| Mark Fetzer Inc 518 6th St, Rapid City 57701 | (605) 348-8481 |