| Business | Phone |
| Aditronics Inc 330 E Maple Rd, Troy 48083 | (248) 589-9400 |
| Assembly Alternatives Inc 1852 Thunderbird, Troy 48084 | (248) 362-1616 |
| Excellence Manufacturing 2215 Highbury Dr, Troy 48085 | (248) 879-0027 |
| Guytron Amplification Systems 1490 Premier Dr C, Troy 48084 | (248) 816-3360 |