| Business | Phone |
| Avers Machine & Manufacturing 4625 N Ronald St, Harwood Heights 60706 | (708) 867-3335 |
| Disco Machine & Mfg Inc 7327 W Agatite Ave, Harwood Heights 60706 | (708) 456-0835 |
| Jav Machine Craft Inc 4624 N Oketo Ave, Harwood Heights 60706 | (708) 867-0950 |
| Alin Machining Co 4624 N Oketo Ave, Harwood Heights 60706 | (708) 867-8608 |