- Silchester Control Systems Ltd - Alton
- Silvabronz - Alton
- Spectech Ltd - Alton
- Springvale Equipment - Alton
- STD Security - Alton
- Teknimek Engineering Ltd - Alton
- Tek-Tanks Ltd - Alton
- Testo Ltd - Alton
- The Aerogen Company Ltd - Alton
- TIS Services - Alton
- Turbex Ltd - Alton
- Vincent Hire - Alton
Companies 51 to 62
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