- Machine Shop & Tool Repair Service, Jessup
- Machine Tool Repair & Rebuild, Jessup
- Machinery Repair & Rebuild, Jessup
- Machinery, Supplies & Equipment - Business Production Related, Jessup
- Machinery, Supplies & Equipment - Business Supplies Related, Jessup
- Machinery, Supplies & Equipment - Construction & Contractor Related, Jessup
- Major Appliances, Jessup - Household & Kitchen
- Management Consultants & Services, Jessup
- Manufacturing, Jessup
- Marriage & Family Counselors, Jessup
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- Merchandising & Pricing Equipment, Jessup
- Mining, Jessup
- Miscellaneous Government, Jessup
- Miscellaneous Photographers, Jessup
- Mortgage Bankers & Correspondents, Jessup
- Motor Vehicle, Jessup
- Motor Vehicle Rental & Leasing, Jessup
- Motorcycle Parts, Accessories & Dealers, Jessup
- Moving Companies, Jessup
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