- Machine Shop & Tool Repair Service, Luxemburg
- Machinery, Supplies & Equipment - Business Supplies Related, Luxemburg
- Machinery, Supplies & Equipment - Construction & Contractor Related, Luxemburg
- Major Appliances, Luxemburg - Household & Kitchen
- Management Consultants & Services, Luxemburg
- Manufacturing, Luxemburg
- Manufacturing Products, Luxemburg
- Masonry Materials & Supplies, Luxemburg
- Meat Market, Wholesale & Products, Luxemburg
- Meat Packers, Luxemburg
- Medical Supplies & Equipment, Luxemburg
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- Metal Buildings, Luxemburg - Kits, Homes, Steel Buildings, etc
- Mexican Restaurants, Luxemburg
- Mini & Self Storage, Luxemburg
- Miscellaneous Government, Luxemburg
- Miscellaneous Personal Services, Luxemburg
- Miscellaneous Photographers, Luxemburg
- Miscellaneous Professional, Luxemburg
- Mortgage Bankers & Correspondents, Luxemburg
- Motor Vehicle, Luxemburg
- Motor Vehicle Rental & Leasing, Luxemburg
- Mowing Service, Luxemburg
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