- Radio Communications Equipment & Systems , Harwinton
- Ready Mix Concrete, Harwinton - Concrete Suppliers, Dealers & Company
- Ready Mix Concrete Producers, Harwinton
- Real Estate, Harwinton - Agent, Broker & Companies
- Real Estate Services, Harwinton
- Refrigeration & Cooling Equipment, Parts & Supplies , Harwinton - Water Cooler, Ice Machine, Beverage Dispenser, etc
- Refrigeration Repair & Service, Harwinton - Ac, Freezer, Refrigerator Repair
- Religious Organizations, Harwinton
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- Repair Services, Harwinton
- Restaurants/Food & Dining, Harwinton
- Retirement Communities & Home, Assisted Living & Apartments, Harwinton
- Road Construction, Harwinton - Companies & Contractors
- Road Construction & Repair Contractors, Harwinton
- Roofing Consultants, Harwinton - Roofing Companies
- Roofing Contractors, Harwinton - Roof Repair, Cleaning, Installation & Maintenance - Roofers
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