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

Wm. Ralph Johnson

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Down spout clean out adapter

Fluid handling – Systems – With flow control means for branched passages
Patent

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Drainage pipe

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

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Profile ID: LFUS-PAI-P-1067939

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