- Machine Shop & Tool Repair Service, Sheffield
- Machinery, Supplies & Equipment - Business Supplies Related, Sheffield
- Machinery, Supplies & Equipment - Construction & Contractor Related, Sheffield
- Mail Delivery Service, Sheffield
- Manufacturing, Sheffield
- Masonry Contractors, Sheffield - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Sheffield
- Mental Health Specialists, Sheffield - Psychologist, Psychiatrist, Psychotherapist, etc
- Metal Repair Service & Blacksmith, Sheffield - Iron Works
- Miscellaneous Government, Sheffield
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