- Machinery, Supplies & Equipment - Business Production Related, Cavan
- Magnetic & Optical Recording Media Manufacturers, Cavan
- Mailing, Delivery & Courier Service, Cavan
- Manufacturing, Cavan
- Masonry Contractors, Cavan - Stone Mason, Brick Mason - Install & Repair
- Massage Therapists & Professional, Cavan
- Massage Therapy, Cavan
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- Mechanical Contractors, Cavan - Install, Service & Repair
- Metal Buildings, Cavan - Kits, Homes, Steel Buildings, etc
- Miscellaneous Industry, Cavan
- Miscellaneous Professional, Cavan
- Motor Vehicle, Cavan
- Motor Vehicle Rental & Leasing, Cavan
- Moving Companies, Cavan
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