- Machine Tools Manufacturers Metal Cutting Types, Dayton
- Machinery And Equipment Manufacturers, Dayton
- Machinery, Supplies & Equipment - Business Production Related, Dayton
- Machinery, Supplies & Equipment - Business Supplies Related, Dayton
- Machinery, Supplies & Equipment - Construction & Contractor Related, Dayton
- Management Consultants & Services, Dayton
- Manicurists & Pedicurists, Dayton
- Manufacturing, Dayton
- Manufacturing Products, Dayton
- Masonry Contractors, Dayton - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Dayton
- Massage Therapy, Dayton
- Medical Supplies & Equipment, Dayton
- Merchandising & Pricing Equipment, Dayton
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- Metal Distributors, Dayton
- Metal Repair Service & Blacksmith, Dayton - Iron Works
- Mexican Restaurants, Dayton
- Mini & Self Storage, Dayton
- Miscellaneous Government, Dayton
- Miscellaneous Personal Services, Dayton
- Moldings Materials, Dayton
- Mortgages & Loans, Dayton
- Motor Vehicle, Dayton
- Motor Vehicle Rental & Leasing, Dayton
- Moving & Storage Supplies & Equipment, Dayton
- Moving Companies, Dayton
- Moving Truck Rental , Dayton
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