4. Illumination
  5. Self powered lamp
  6. Rechargeable electrical source of with external connections

John R. Hart

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Cast concrete element for underground tubular structure

Hydraulic and earth engineering – Underground passageway – e.g. – tunnel – Lining
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Solar powered lighting system

Illumination – Self powered lamp – Rechargeable electrical source of with external connections
Patent

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Profile ID: LFUS-PAI-P-1546720

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