| Business | Phone |
| Diversified Engineering 801 S Garfield Ave, Traverse City 49686 | (231) 947-1455 |
| Joseph H Elliott Po Box 927, Traverse City 49685 | (231) 946-5874 |
| Fleis & Vandenbrink Engrng Inc 3491 Hartman Rd, Traverse City 49684 | (231) 944-1043 |
| Gary L Plum 214 Homestead Ct, Traverse City 49686 | (231) 941-5725 |