- Machine Shop & Tool Repair Service, East Granby
- Machinery Repair & Rebuild, East Granby
- Machinery, Supplies & Equipment - Business Supplies Related, East Granby
- Machinery, Supplies & Equipment - Construction & Contractor Related, East Granby
- Mailing, Delivery & Courier Service, East Granby
- Major Appliances, East Granby - Household & Kitchen
- Management Consultants & Services, East Granby
- Manicurists & Pedicurists, East Granby
- Manufacturing, East Granby
- Manufacturing Products, East Granby
- Masonry Contractors, East Granby - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, East Granby
- Meat Market, Wholesale & Products, East Granby
- Mechanical Contractors, East Granby - Install, Service & Repair
- Medical Diagnostic Clinics, East Granby - Clinical Labs & Centers
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- Medical Supplies & Equipment, East Granby
- Merchandise Sales Events, East Granby
- Metal Heat Treating, East Granby
- Metal Repair Service & Blacksmith, East Granby - Iron Works
- Metal Working Machinery, East Granby
- Methodist Church, East Granby
- Miscellaneous Fabricated Wire Products Manufacturers, East Granby
- Miscellaneous Government, East Granby
- Miscellaneous Manufacturing, East Granby
- Motor Vehicle, East Granby
- Motor Vehicle Rental & Leasing, East Granby
- Moving & Storage Supplies & Equipment, East Granby
- Moving Companies, East Granby
- Museums, East Granby
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