4. Hydraulic and earth engineering
  5. Drainage or irrigation
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Water flow responsive barrier for gutters and storm drains...

Hydraulic and earth engineering – Drainage or irrigation – Having regulation of flow through channel
Reexamination Certificate

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Water management system

Hydraulic and earth engineering – Drainage or irrigation – Porous or apertured pipe – flume – or tileway
Patent

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Water removal system

Hydraulic and earth engineering – Drainage or irrigation – Porous or apertured pipe – flume – or tileway
Patent

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Water resource recycling system

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

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Water-retaining barrier and method of construction

Hydraulic and earth engineering – Drainage or irrigation
Patent

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Watering hose

Hydraulic and earth engineering – Drainage or irrigation – Porous or apertured pipe – flume – or tileway
Patent

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Watering system

Hydraulic and earth engineering – Drainage or irrigation – Control means responsive to sensed condition
Patent

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Waterway

Hydraulic and earth engineering – Drainage or irrigation – Including subsurface moisture barrier
Reexamination Certificate

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