| Business | Phone |
| Advanced Panels & Controls Inc 300 Travis Ln # 14, Waukesha 53189 | (262) 513-1804 |
| Wisconsin Control Corp N8w22520 Johnson Dr A, Waukesha 53186 | (262) 542-1588 |
| Csi Ind Products Corp W239n1690 Busse Rd, Waukesha 53188 | (262) 548-3950 |
| Environmental Systems Inc W223n603 Saratoga Dr, Waukesha 53186 | (262) 544-0372 |
| Excel Electronic Controls Inc W243s6110 Elder Ayre Dr, Waukesha 53189 | (262) 521-9340 |
| Mac Systems Inc 611 N Barstow St, Waukesha 53186 | (262) 544-6100 |