| Business | Phone |
| D W Schmidt & Assoc 4250 Norwood Dr, Trenton 48183 | (734) 675-0420 |
| Focus Business Solutions 2674 W Jefferson Ave, Trenton 48183 | (734) 675-5024 |
| R & D Management Svc Trenton 48183 | (734) 676-9087 |
| Systrand Manufacturing 19050 Allen Rd, Trenton 48183 | (734) 479-8100 |