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

Edward P. Johnson

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Apparatus for rejuvenating a drainfield or drywell

Brushing – scrubbing – and general cleaning – Machines – With air blast or suction
Patent

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Drain field container system

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

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Method and apparatus for rejuvenating a drainfield or dry well

Brushing – scrubbing – and general cleaning – Machines – With air blast or suction
Patent

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Method for rejuvenating a drainfield or dry well

Cleaning and liquid contact with solids – Processes – Including use of vacuum – suction – or inert atmosphere
Patent

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