- Machine Shop & Tool Repair Service, Chelsea
- Machinery, Supplies & Equipment - Business Supplies Related, Chelsea
- Management Consultants & Services, Chelsea
- Manufacturers Agents & Representatives, Chelsea
- Manufacturers Representative, Chelsea - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Chelsea
- Manufacturing Products, Chelsea
- Mechanical Contractors, Chelsea - Install, Service & Repair
- Merchandise Sales Events, Chelsea
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- Metal Galvanizing, Chelsea
- Methodist Church, Chelsea
- Mining, Chelsea
- Miscellaneous Government, Chelsea
- Miscellaneous Manufacturing, Chelsea
- Miscellaneous Photographers, Chelsea
- Monuments, Tombstones, Markers & Memorials, Chelsea
- Motor Vehicle, Chelsea
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