- Ice Cream & Frozen Yogurt, Sandwich
- Ice Sports Clubs & Instruction, Sandwich
- Ice Wholesale, Sandwich - Dry Ice
- Industrial & Commercial Cleaning Services & Companies, Sandwich
- Industrial & Commercial Real Estate, Sandwich
- Industrial & Heavy Equipment Repair & Service, Sandwich
- Industrial Equipment & Machinery, Sandwich
- Industrial Equipment & Systems, Sandwich
- Industrial Goods & Products - Hard Goods - Large, Sandwich
- Industrial Goods & Products - Hard Goods - Small, Sandwich
- Industrial Goods & Products - Soft - Large & Small, Sandwich
- Industrial Machinery Supplies & Equipment - Leasing & Rental, Sandwich
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- Industrial Pump Repair & Service, Sandwich - Centrifugal, Positive Displacement, Submersible, Diaphragm, Hydraulic, Water, Vacuum Pumps, etc
- Industry, Sandwich
- Inspection & Testing Services, Sandwich
- Insurance Brokers, Sandwich
- Insurance Carriers, Sandwich
- Insurance Services, Sandwich
- Interior Designers, Sandwich
- Interior Designers & Decorators, Sandwich
- Internal Medicine Doctors, Sandwich - Internists Physicians & Surgeons
- Investment Services & Advisors, Sandwich
- Italian Restaurants, Sandwich
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