| Business | Phone |
| Campbell Engineering Corp 7701 Candlewood Ln, Indianapolis 46250 | (317) 842-0027 |
| Criterium Winchell Engineers 4141 Melbourne Rd, Indianapolis 46228 | (317) 291-8286 |
| Walsh Engineering Svc Pc 8826 Southeastern Ave, Indianapolis 46239 | (317) 862-4738 |
| Silver Creek Engineering Inc 7108 Waldemar Dr, Indianapolis 46268 | (317) 297-5610 |