4. Hydraulic and earth engineering
  5. Underground passageway, e.g., tunnel
  6. Boring

Penta-Ocean Construction Co. Ltd.

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Method for improving soft ground by sand drain method and cylind

Hydraulic and earth engineering – Drainage or irrigation – Porous waterway – e.g. – sand drain – etc.
Patent

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Mooring apparatus

Ships – Mooring device – Boom type
Patent

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Rectangular shield excavating machine

Hydraulic and earth engineering – Underground passageway – e.g. – tunnel – Boring
Patent

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