| Business | Phone |
| Diamond Coring Co Inc 11607 S Avenue J, Chicago 60617 | (773) 646-0055 |
| Cobra Concrete Cutting Svc Co 1900 N Austin Ave, Chicago 60639 | (773) 775-1111 |
| Cobra Concrete Cutting Svc Co 5230 W Winona St, Chicago 60630 | (773) 794-9999 |
| Concrete Cutting Svc 517 N Racine Ave, Chicago 60622 | (312) 492-6000 |