| Business | Phone |
| Astronautics Corp Of America 718 Walsh Rd, Madison 53714 | (608) 243-8020 |
| Biocommunication Electronics 4330 Beilfuss Dr, Madison 53704 | (608) 243-1229 |
| Saztech Llc 4222 Milwaukee St, Madison 53714 | (608) 244-6881 |
| Gatewave Northern Inc 3002 Progress Rd, Madison 53716 | (608) 224-1250 |