| Business | Phone |
| Zabel Engineering 203 S Rosedale Ave, Aurora 60506 | (630) 892-0698 |
| Walter E Deuchler Assoc Inc 230 Woodlawn Ave, Aurora 60506 | (630) 897-4651 |
| Tkda 3675 Darlene Ct D, Aurora 60504 | (630) 499-4110 |
| Runde Engineering Inc 427 Kingsway Dr, Aurora 60506 | (630) 966-0250 |
| Crawford Murphy & Tilly Inc 600 N Commons Dr 107, Aurora 60504 | (630) 820-1022 |
| Dimonte Group Inc 32w119 Molitor Rd, Aurora 60502 | (630) 978-7095 |
| Elemech Inc 1100 Mitchell Rd, Aurora 60505 | (630) 844-0205 |
| Engineering Systems Inc 3851 Exchange Ave, Aurora 60504 | (630) 851-4566 |
| Mc Coy Engineering 52 W Downer Pl, Aurora 60506 | (630) 859-9594 |
| Elemech Inc 2275 White Oak Cir, Aurora 60502 | (630) 499-7080 |
| Leonard Dreas & Assoc 888 S Edgelawn Dr 1725, Aurora 60506 | (630) 897-4105 |