- Machine Shop, Ambridge
- Machine Shop & Tool Repair Service, Ambridge
- Machinery And Equipment Manufacturers, Ambridge
- Machinery Custom Design Manufacturers, Ambridge
- Machinery, Supplies & Equipment - Business Production Related, Ambridge
- Machinery, Supplies & Equipment - Business Supplies Related, Ambridge
- Machinery, Supplies & Equipment - Construction & Contractor Related, Ambridge
- Mail Delivery Service, Ambridge
- Major Appliances, Ambridge - Household & Kitchen
- Malpractice Attorneys & Lawyers, Ambridge
- Malpractice Attorneys & Lawyers, Ambridge
- Malpractice Lawyers & Attorneys, Ambridge
- Management Consultants & Services, Ambridge
- Manufacturers Agents & Representatives, Ambridge
- Manufacturers Representative, Ambridge - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Ambridge
- Manufacturing Products, Ambridge
- Masonry Contractors, Ambridge - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Ambridge
- Material Handling Equipment, Ambridge - Conveyor Belt, Pallet Jack, Forklift, etc
- Maytag Appliances, Ambridge
- Meat Market, Wholesale & Products, Ambridge
- Mechanical Engineer, Ambridge - Mechanical Engineering Service
- Medical Diagnostic Clinics, Ambridge - Clinical Labs & Centers
- Medical Equipment Manufacturers, Ambridge
- Medical Products & Equipment, Ambridge
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- Medical Supplies & Equipment, Ambridge
- Men's Clothing Stores, Ambridge - Clothes & Accessories
- Metal Galvanizing, Ambridge
- Metal Repair Service & Blacksmith, Ambridge - Iron Works
- Metal Specialties, Ambridge
- Methodist Church, Ambridge
- Millwork Contractors, Ambridge
- Mining, Ambridge
- Mining Contractors, Ambridge - Mining Companies, Contractors & Brokers
- Mining, Crude-Oil Production, Ambridge - Mining Companies
- Miscellaneous Government, Ambridge
- Miscellaneous Manufacturing, Ambridge
- Miscellaneous Personal Services, Ambridge
- Miscellaneous Photographers, Ambridge
- Miscellaneous Professional, Ambridge
- Mission Churches, Ambridge
- Mortgage Bankers & Correspondents, Ambridge
- Motion Picture Pre & Post Production Services, Ambridge
- Motor Vehicle, Ambridge
- Motorcycle & Motor Scooters Dealers, Repair & Service, Ambridge
- Motorcycle Parts, Accessories & Dealers, Ambridge
- Motorcycle Repair & Service, Ambridge
- Muffler Shop & Exhaust Systems, Ambridge
- Music, Ambridge
- Musical Instruments Repair, Sales & Service, Ambridge
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