Underdrainage pipe

E - Fixed Constructions – 02 – B

Patent

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61/32

E02B 11/00 (2006.01)

Patent

CA 1073226

TITLE OF THE INVENTION Underdrainage Pipe ABSTRACT OF THE DISCLOSURE An underdrainage pipe comprises a liquid-collecting pipe, protrusions on the liquid-collecting pipe, a filter layer around the liquid-collecting pipe and a liquid-conducting way, and the protrusions having at least one recess for each and the bottom portion of the recess not reaching the surface of the liquid-collecting pipe.

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