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US07811030B2 Water drainage system for a field having a water impermeable layer 失效
具有不透水层的场地排水系统

Water drainage system for a field having a water impermeable layer
Abstract:
The tubular element is made with a sleeve formed of a spun bonded polyester material that allows the passage of water and prevents the passage of soil when used for a drainage element. The tubular element is made with small diameters that allows the element to be coiled about a three-dimensional object when used as a cushioning device.
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