4. Hydraulic and earth engineering
  5. Drainage or irrigation
  6. Porous or apertured pipe, flume, or tileway

Dennis F. Hallahan

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Corrugated leaching chamber with hollow pillar supports

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

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Radial flow septic tank

Liquid purification or separation – Diverse distinct separators – Including a filter
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Profile ID: LFUS-PAI-P-2322266

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