| Business | Phone |
| Mech-Tronics Corp 1635 N 25th Ave, Melrose Park 60160 | (708) 344-9823 |
| Hi-Temp Inc 75 E Lake St, Melrose Park 60164 | (708) 345-5800 |
| Hi-Temp Inc 5400 W Lake St, Melrose Park 60160 | (708) 410-8000 |
| Thermal Bodycote 1975 N Ruby St, Melrose Park 60160 | (708) 865-1654 |