- Machinery, Supplies & Equipment - Business Supplies Related, Shelter Island
- Maintenance, Cleaning & Sanitation, Shelter Island
- Manufacturing, Shelter Island
- Marinas & Marina Services, Shelter Island
- Marine Products And Services, Shelter Island
- Marine Repair & Service Stations, Shelter Island
- Marine Supplies & Equipment, Shelter Island - Boat Supplies
- Marine Supplies & Equipment Repair, Shelter Island - Boat Supplies & Equipment
- Masonry Contractors, Shelter Island - Stone Mason, Brick Mason - Install & Repair
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