4. Hydraulic and earth engineering
  5. Drainage or irrigation
  6. Porous waterway, e.g., sand drain, etc.
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Catchwater drain, excavating structure and method of constructio

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

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Cooling water intake system

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

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