| Business | Phone |
| Deka Engineering Llc 313 Park Central E, Springfield 65806 | (417) 865-2980 |
| White River Engineering Inc 700 W Wall St, Springfield 65802 | (417) 862-3355 |
| Sci Engineering Inc 4145 S Mccann Ct, Springfield 65804 | (417) 823-0355 |
| Packard Engineering 3582 N Thistlewood Ct, Springfield 65803 | (417) 833-8500 |
| Mettemeyer Engineering Llc 3050 S National Ave, Springfield 65804 | (417) 863-0037 |