- Machine Shop & Tool Repair Service, Fairport Harbor
- Machinery, Supplies & Equipment - Construction & Contractor Related, Fairport Harbor
- Maintenance, Cleaning & Sanitation, Fairport Harbor
- Manufacturing, Fairport Harbor
- Manufacturing Products, Fairport Harbor
- Manufacturing Services, Fairport Harbor
- Marinas & Marina Services, Fairport Harbor
- Marine & Boat Products, Fairport Harbor
- Marine Products And Services, Fairport Harbor
- Marine Repair & Service Stations, Fairport Harbor
- Marine Supplies & Equipment, Fairport Harbor - Boat Supplies
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- Marine Supplies & Equipment Repair, Fairport Harbor - Boat Supplies & Equipment
- Metal Stampings Manufacturers, Fairport Harbor
- Mildew Removal & Control, Fairport Harbor - Mold Removal
- Miscellaneous Government, Fairport Harbor
- Miscellaneous Metal Work Manufacturers, Fairport Harbor
- Miscellaneous Professional, Fairport Harbor
- Motor Vehicle, Fairport Harbor
- Motorcycle & Motor Scooters Dealers, Repair & Service, Fairport Harbor
- Motorcycle Repair & Service, Fairport Harbor
- Museums, Fairport Harbor
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