- Machine Shop & Tool Repair Service, Trafford
- Machine Tool Repair & Rebuild, Trafford
- Machinery, Supplies & Equipment - Business Production Related, Trafford
- Machinery, Supplies & Equipment - Business Supplies Related, Trafford
- Machinery, Supplies & Equipment - Construction & Contractor Related, Trafford
- Management Consultants & Services, Trafford
- Manicurists & Pedicurists, Trafford
- Manufacturers Agents & Representatives, Trafford
- Manufacturers Representative, Trafford - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Trafford
- Manufacturing Products, Trafford
- Medical Supplies & Equipment, Trafford
- Metal Finishers, Trafford
- Metal Plating & Polishing, Trafford
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- Metal Repair Service & Blacksmith, Trafford - Iron Works
- Metal Specialties, Trafford
- Mining, Trafford
- Mining Contractors, Trafford - Mining Companies, Contractors & Brokers
- Mining, Crude-Oil Production, Trafford - Mining Companies
- Miscellaneous Government, Trafford
- Miscellaneous Manufacturing, Trafford
- Miscellaneous Professional, Trafford
- Mobile Home Parks & Communities , Trafford
- Monuments, Tombstones, Markers & Memorials, Trafford
- Mortgage Bankers & Correspondents, Trafford
- Motor Vehicle, Trafford
- Movie Theaters, Trafford
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