- Machine Shop & Tool Repair Service, East Berlin
- Machinery, Supplies & Equipment - Business Production Related, East Berlin
- Machinery, Supplies & Equipment - Business Supplies Related, East Berlin
- Machinery, Supplies & Equipment - Construction & Contractor Related, East Berlin
- Major Appliances, East Berlin - Household & Kitchen
- Mammography Clinics, East Berlin - Breast Cancer Screening
- Management Consultants & Services, East Berlin
- Manufacturers Agents & Representatives, East Berlin
- Manufacturers Representative, East Berlin - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, East Berlin
- Manufacturing Products, East Berlin
- Mary Kay Cosmetics, East Berlin
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- Meat Market, Wholesale & Products, East Berlin
- Mechanical Contractors, East Berlin - Install, Service & Repair
- Medical Diagnostic Clinics, East Berlin - Clinical Labs & Centers
- Membership Sports & Recreation Clubs, East Berlin
- Miscellaneous Government, East Berlin
- Miscellaneous Manufacturing, East Berlin
- Miscellaneous Personal Services, East Berlin
- Miscellaneous Professional, East Berlin
- Moldings Materials, East Berlin
- Motor Vehicle, East Berlin
- Municipal Supplies, East Berlin
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