- Machine Shop & Tool Repair Service, Michigan Center
- Machinery, Supplies & Equipment - Business Supplies Related, Michigan Center
- Machinery, Supplies & Equipment - Construction & Contractor Related, Michigan Center
- Masonry Materials & Supplies, Michigan Center
- Medical Diagnostic Clinics, Michigan Center - Clinical Labs & Centers
- Medical Supplies & Equipment, Michigan Center
- Metal Repair Service & Blacksmith, Michigan Center - Iron Works
- Metal Working Machinery, Michigan Center
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