| Business | Phone |
| Kreft Engineering 701 Cherokee St, Traverse City 49684 | (231) 932-1512 |
| Avanti Engineering 3180 Racquet Club Dr, Traverse City 49684 | (231) 933-0130 |
| Ctm Assoc Inc 235 W Grandview Pkwy, Traverse City 49684 | (231) 946-1919 |
| Trison Engineering Group Inc 3301 Veterans Dr 201, Traverse City 49684 | (231) 932-9177 |