| Business | Phone |
| Ias 1100 Owendale Dr M, Troy 48083 | (248) 619-9293 |
| International Design Corp 2901 John R Rd, Troy 48083 | (248) 680-1610 |
| Accutech Design Svc 5300 John R Rd, Troy 48085 | (248) 879-1928 |
| Systems Design Inc 4107 John R Rd # 100, Troy 48085 | (248) 619-9790 |
| Design Resolutions 1526 Devonshire Dr, Troy 48098 | (248) 267-8421 |
| Detroit Design Engineering 799 Stephenson Hwy, Troy 48083 | (248) 585-0770 |
| Engineering Service Inc 33259 Dequindre Rd, Troy 48083 | (248) 589-7800 |
| Erie Engineering Co 1401 E 14 Mile Rd, Troy 48083 | (248) 585-6500 |