| Business | Phone |
| Alcoa Csi 8550 W Bryn Mawr Ave 10, Chicago 60631 | (773) 380-7717 |
| Amsco Diversified Packaging 7829 S South Shore Dr, Chicago 60649 | (773) 731-6960 |
| Elau Inc 4201 W Wrightwood Ave, Chicago 60639 | (847) 490-4206 |
| Designtech Engineering Co 2001 S Blue Island Ave, Chicago 60608 | (312) 243-4700 |