| Business | Phone |
| Hoffman Enclosures 201 Hansen Ct, Wood Dale 60191 | (630) 595-8740 |
| Lbv Engineering Inc 602 Catherine Ct, Wood Dale 60191 | (630) 860-9966 |
| Pdr Engineers Inc 6n641 N Cedar Ave, Wood Dale 60191 | (630) 250-0354 |
| Wcw Engineers Inc 760 Creel Dr, Wood Dale 60191 | (630) 595-8800 |