- Secondary Schools, Groton
- Security & Surveillance System & Equipment, Groton
- Security Alarm Systems - Home & Business, Groton
- Security Brokers & Dealers, Groton
- Security Control Systems & Monitoring, Groton - Polygraph, Lie Detector, CCTV, Fire Sensor Equipment, Etc
- Security Services, Groton
- Septic Tank Pumping & Cleaning, Groton - Septic Systems
- Sewing & Yarn Stores & Supplies, Groton
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