- Machine Shop & Tool Repair Service, Hamilton
- Machinery, Supplies & Equipment - Construction & Contractor Related, Hamilton
- Mailing, Delivery & Courier Service, Hamilton
- Management Training & Development, Hamilton
- Manufacturing, Hamilton
- Manufacturing Products, Hamilton
- Masonry Materials & Supplies, Hamilton
- Meat Market, Wholesale & Products, Hamilton
- Metal Repair Service & Blacksmith, Hamilton - Iron Works
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