| Business | Phone |
| Underwriters Laboratories Inc 1550 N Northwest Hwy, Park Ridge 60068 | (847) 664-1650 |
| Vascular Diagnostics Ltd 1600 Dempster St 105, Park Ridge 60068 | (847) 298-7876 |
| Vascular Diagnostics 1600 W Dempster St, Park Ridge 60068 | (847) 298-7875 |