- Machine Shop & Tool Repair Service, Rockdale
- Machinery, Supplies & Equipment - Business Production Related, Rockdale
- Machinery, Supplies & Equipment - Business Supplies Related, Rockdale
- Machinery, Supplies & Equipment - Construction & Contractor Related, Rockdale
- Manufacturing, Rockdale
- Manufacturing Products, Rockdale
- Marking, Stamping & Engraving Equipment, Rockdale
- Masonry Contractors, Rockdale - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Rockdale
- Material Handling & Heavy Machinery & Equipment, Rockdale
- Metal Coating & Allied Services, Rockdale
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- Mexican Restaurants, Rockdale
- Mining, Rockdale
- Mining Contractors, Rockdale - Mining Companies, Contractors & Brokers
- Mining, Crude-Oil Production, Rockdale - Mining Companies
- Miscellaneous Household Item Repair, Rockdale
- Miscellaneous Government, Rockdale
- Miscellaneous Industry, Rockdale
- Motor Vehicle, Rockdale
- Motor Vehicle Rental & Leasing, Rockdale
- Moving Companies, Rockdale
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