4. Hydraulic and earth engineering
  5. Drainage or irrigation
  6. Porous waterway, e.g., sand drain, etc.

Sylvain V. L. Chevanne

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Draining, irrigating and dispersing mass

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

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Draining, irrigating and dispersing mass

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

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Wall construction prefabricated from self-connectable elements

Static structures (e.g. – buildings) – With synthetic resinous component – With nonresinous component
Patent

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