| Business | Phone |
| Dci Engineering Consultants 3026 Harvest Ave Sw, Grandville 49418 | (616) 531-0066 |
| System Engineering 210 Front Street Sw, Grandville 49418 | (616) 224-7727 |
| Medical Engineering & Design 2810 Franklin Ave Sw, Grandville 49418 | (616) 261-8264 |