4. Hydraulic and earth engineering
  5. Drainage or irrigation
  6. Porous waterway, e.g., sand drain, etc.
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Soil filtration and water drainage device

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

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Structural modular interconnectable subsoil drainage cell

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

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Subsurface drainage system and drain structure therefor

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

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Subsurface drainage system and drain structure therefor

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

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Subsurface drainage system and drain structure therefor

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

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Subsurface drainage system and drain structure therefor

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

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Subsurface drainage system and method of installing the same

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

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Subterranean drainage device

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

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System for draining land areas through siphoning from a permeabl

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

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