4. Hydraulic and earth engineering
  5. Drainage or irrigation
  6. Porous waterway, e.g., sand drain, etc.
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Means for providing a vertical drain in soil

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

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Means for providing a vertical drain in soil

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

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Method and apparatus for enhancement of prefabricated earth...

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

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Method and apparatus for laying drains in frost-susceptible grou

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

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Method and apparatus of forming sand piles for improving a soft

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

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Method and device for inserting a drainage wick

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

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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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Method of confirming position of drain material left and apparat

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

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Multi-use fluid collection and transport apparatus

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

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