4. Hydraulic and earth engineering
  5. Drainage or irrigation
  6. Having regulation of flow through channel
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Riser assembly for a sub-surface irrigation and drainage system

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

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Roadway surface grating with trash detention during drier...

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

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