- Machine Shop & Tool Repair Service, Contrecoeur
- Machine Tool Repair & Rebuild, Contrecoeur
- Machinery, Supplies & Equipment - Construction & Contractor Related, Contrecoeur
- Manufacturing, Contrecoeur
- Manufacturing Products, Contrecoeur
- Marinas & Marina Services, Contrecoeur
- Marine Cargo Handling, Contrecoeur
- Masonry Materials & Supplies, Contrecoeur
- Mechanical Contractors, Contrecoeur - Install, Service & Repair
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- Medical Supplies & Equipment, Contrecoeur
- Metal Buildings, Contrecoeur - Kits, Homes, Steel Buildings, etc
- Metal Repair Service & Blacksmith, Contrecoeur - Iron Works
- Mini & Self Storage, Contrecoeur
- Mining, Contrecoeur
- Miscellaneous Business Services, Contrecoeur
- Motor Vehicle, Contrecoeur
- Motor Vehicle Rental & Leasing, Contrecoeur
- Moving Truck Rental , Contrecoeur
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