- School - Christian, Derry
- Scrap & Waste Materials, Derry
- Screen Printing, Derry
- Secondary Schools, Derry
- Security Alarm Systems - Home & Business, Derry
- Security Control Systems & Monitoring, Derry - Polygraph, Lie Detector, CCTV, Fire Sensor Equipment, Etc
- Security Services, Derry
- Sewage Plant Operation, Derry
- Sewer & Drain Cleaning & Repair, Derry - Drain Cleaner & Installation Services
- Sewer Construction Contractors, Derry - Sewer Line, Pipe Installation & Repair Services
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