- Machine Shop & Tool Repair Service, Glassport
- Machine Tool Repair & Rebuild, Glassport
- Machinery, Supplies & Equipment - Business Supplies Related, Glassport
- Machinery, Supplies & Equipment - Construction & Contractor Related, Glassport
- Manufacturing, Glassport
- Manufacturing Products, Glassport
- Masonry Materials & Supplies, Glassport
- Metal Cleaning & Pickling, Glassport
- Metal Finishers, Glassport
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- Metal Plating & Polishing, Glassport
- Methodist Church, Glassport
- Mill Supply & Equipment, Glassport
- Mine Shaft Contractors, Glassport
- Mining Contractors, Glassport - Mining Companies, Contractors & Brokers
- Miscellaneous Business Services, Glassport
- Motor Vehicle, Glassport
- Motor Vehicle Rental & Leasing, Glassport
- Moving Truck Rental , Glassport
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