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

David E. Fales

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Corrugated drainage tubing and method and apparatus for making d

Gear cutting – milling – or planing – Milling – Means for internal milling
Patent

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Corrugated drainage tubing with helically arranged drainage open

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

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Profile ID: LFUS-PAI-P-1519903

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