| Business | Phone |
| E S Endeavor Information 1350 E Touhy Ave, Des Plaines 60018 | (847) 299-6125 |
| Leader Us 2434 E Dempster St 102, Des Plaines 60016 | (847) 699-6555 |
| Endeavor Information Systs Inc 1350 E Touhy Ave 200, Des Plaines 60018 | (847) 296-2200 |
| Q S Metrology 264 Howard Ave, Des Plaines 60018 | (847) 299-7266 |