- Machinery, Supplies & Equipment - Business Production Related, Brockway
- Machinery, Supplies & Equipment - Construction & Contractor Related, Brockway
- Mailing, Delivery & Courier Service, Brockway
- Major Appliances, Brockway - Household & Kitchen
- Management Consultants & Services, Brockway
- Manufacturing, Brockway
- Manufacturing Products, Brockway
- Masonry Contractors, Brockway - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Brockway
- Medical & Infectious Waste Disposal, Brockway
- Metal Powder Parts Fabricators, Brockway
- Metal Repair Service & Blacksmith, Brockway - Iron Works
- Methodist Church, Brockway
- Mining, Brockway
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- Mining Consultants, Brockway
- Mining Contractors, Brockway - Mining Companies, Contractors & Brokers
- Mining, Crude-Oil Production, Brockway - Mining Companies
- Miscellaneous Government, Brockway
- Miscellaneous Personal Services, Brockway
- Modular & Mobile Homes For Sale, Brockway - Manufactured Homes Sale & Service
- Motor Vehicle, Brockway
- Motor Vehicle Rental & Leasing, Brockway
- Motorcycle & ATV Repair & Service, Brockway
- Motorcycle & Motor Scooters Dealers, Repair & Service, Brockway
- Motorcycle Parts, Accessories & Dealers, Brockway
- Motorcycle Repair & Service, Brockway
- Muffler Shop & Exhaust Systems, Brockway
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