| Business | Phone |
| Airmatic Systems Corp 5254 W 51st St, Chicago 60638 | (708) 458-8884 |
| Lakewood Engineering & Mfg Co 501 N Sacramento Blvd, Chicago 60612 | (773) 722-4300 |
| Husband Manufacturing Co 204 W 91st St, Chicago 60620 | (773) 568-3860 |
| Mountain-Aire Products Co 5143 W Diversey Ave, Chicago 60639 | (773) 889-0600 |