4. Hydraulic and earth engineering
  5. Drainage or irrigation
  6. Porous waterway, e.g., sand drain, etc.

Gary L. Shaffer

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Drainable base course for a landfill and method of forming...

Hydraulic and earth engineering – Subterranean waste disposal – containment – or treatment – Landfill
Reexamination Certificate

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High-flow void-maintaining membrane laminates, grids and...

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

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Profile ID: LFUS-PAI-P-3001081

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