- Machine Shop & Tool Repair Service, Bridgeport
- Machine Shop Rotary Surface Grinding, Bridgeport - Tool Grinding & Sharpening
- Machinery, Supplies & Equipment - Business Production Related, Bridgeport
- Machinery, Supplies & Equipment - Business Supplies Related, Bridgeport
- Machinery, Supplies & Equipment - Construction & Contractor Related, Bridgeport
- Major Appliances, Bridgeport - Household & Kitchen
- Manufacturing, Bridgeport
- Manufacturing Products, Bridgeport
- Masonry Materials & Supplies, Bridgeport
- Material Handling Equipment, Bridgeport - Conveyor Belt, Pallet Jack, Forklift, etc
- Medical Diagnostic Clinics, Bridgeport - Clinical Labs & Centers
- Medical Research, Bridgeport
- Medical Research & Development, Bridgeport - Medical Information & Research
- Medical Supplies & Equipment, Bridgeport
- Metal Products, Bridgeport
- Mexican Restaurants, Bridgeport
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- Mini & Self Storage, Bridgeport
- Miscellaneous Commercial & Industrial Supplies & Equipment Rental & Leasing, Bridgeport
- Miscellaneous Government, Bridgeport
- Miscellaneous Photographers, Bridgeport
- Mobile Homes for Rent & Lease, Bridgeport
- Model Trains, Bridgeport
- Motion Picture Pre & Post Production Services, Bridgeport
- Motion Pictures Video Tape Duplication & Transfer Services, Bridgeport
- Motor Vehicle, Bridgeport
- Motor Vehicle Rental & Leasing, Bridgeport
- Motorcycle & Motor Scooters Dealers, Repair & Service, Bridgeport
- Motorcycle Parts, Accessories & Dealers, Bridgeport
- Motorcycle Repair & Service, Bridgeport
- Moving Supplies & Equipment Rental, Bridgeport
- Moving Truck Rental , Bridgeport
- Museums, Bridgeport
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