- Machine Shop, Houston
- Machine Shop & Tool Repair Service, Houston
- Machinery, Supplies & Equipment - Business Production Related, Houston
- Machinery, Supplies & Equipment - Construction & Contractor Related, Houston
- Management Consultants & Services, Houston
- Manufacturers Agents & Representatives, Houston
- Manufacturers Representative, Houston - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Houston
- Manufacturing Products, Houston
- Maps & Supplies, Houston
- Medical Alert Systems, Houston - Medical Alarms - PERS
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- Medical Supplies & Equipment, Houston
- Mental Retardation & Developmentally Disabled Services, Houston
- Metal Goods Alloys, Houston
- Methodist Church, Houston
- Mini & Self Storage, Houston
- Mining Equipment & Supplies, Houston
- Mining Equipment & Supplies Service & Repair, Houston
- Miscellaneous Manufacturing, Houston
- Miscellaneous Professional, Houston
- Motor Vehicle, Houston
- Muffler Shop & Exhaust Systems, Houston
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