| Business | Phone |
| Access Diagnostics Inc 3800 Woodward Ave, Detroit 48201 | (313) 833-6388 |
| E Max Inc 453 Martin Luther King Jr Blvd, Detroit 48201 | (313) 832-7660 |
| Bci Intl Group Detroit 48205 | (313) 245-1153 |
| Shrader Analytical-Consulting 3814 Vinewood St, Detroit 48208 | (313) 894-4440 |
| Mullane Industries Inc 5941 Livernois Ave, Detroit 48210 | (313) 896-3100 |
| Thyssen Krupp Laboratory Svc 3 Thyssen Pl, Detroit 48210 | (313) 899-6250 |
| National Technical Systems Inc 12601 Southfield Fwy, Detroit 48223 | (313) 835-0044 |
| Xytek Industries Inc 19431 W Davison St, Detroit 48223 | (313) 838-6961 |
| Link Engineering 13840 Elmira St, Detroit 48227 | (313) 933-0710 |
| National Testing & Research 11301 Schaefer Hwy, Detroit 48227 | (313) 834-7500 |
| Link Testing Laboratories 13840 Elmira St, Detroit 48227 | (313) 933-4900 |