| Business | Phone |
| Amelex Inc 445 S Ingram Mill Rd, Springfield 65802 | (417) 864-8987 |
| Interconnect Technologies 4811 W Kearney St, Springfield 65803 | (417) 829-5200 |
| Northrop Grumman Interconnect 4811 W Kearney St, Springfield 65803 | (417) 862-0751 |
| Ozark Circuits Inc 933 W Chase St, Springfield 65803 | (417) 864-5004 |