| Business | Phone |
| Westbrook Engineering Co 24220 Mound Rd, Warren 48091 | (586) 427-3922 |
| Prestige Inc Engineering 3630 E 13 Mile Rd, Warren 48092 | (586) 573-3070 |
| Paslin Engineering Group 3400 E 10 Mile Rd, Warren 48091 | (586) 754-5777 |
| Gilbar Engineering 6985 Miller Dr, Warren 48092 | (586) 939-5300 |
| Infinity Controls 32486 Dequindre Rd, Warren 48092 | (586) 826-3622 |
| Jagiii Engineering & Tech Svc 3439 Esch Dr, Warren 48091 | (586) 759-0052 |