| Business | Phone |
| Accurate Calibration & Repair 1924 Pinnacle Dr, Aurora 60502 | (630) 236-0439 |
| Sirrera Enterprises 30 S Stolp Ave 405, Aurora 60506 | (630) 264-2757 |
| Rds Inst & Electronics Inc 3019 Fairfield Ln, Aurora 60504 | (630) 898-9889 |
| Opto 22 Aurora 60504 | (630) 820-6703 |