- Machinery, Supplies & Equipment - Business Production Related, East Sandwich
- Manufacturing, East Sandwich
- Marine Products And Services, East Sandwich
- Marine Repair & Service Stations, East Sandwich
- Marine Supplies & Equipment Repair, East Sandwich - Boat Supplies & Equipment
- Massage Therapists & Professional, East Sandwich
- Massage Therapy, East Sandwich
- Mats & Matting, East Sandwich
- Medical Research, East Sandwich
- Medical Research & Development, East Sandwich - Medical Information & Research
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