DIN EN 13508-2:2011-08 Investigation and assessment of drain and sewer systems outside buildings - Part 2: Visual inspection coding system; German version EN 13508-2:2003+A1:2011
2011DIN EN 13508-2:2011-08 Investigation and assessment of drain and sewer systems outside buildings - Part 2: Visual inspection coding system; German version EN 13508-2:2003+A1:2011
2011DIN EN 13508-2:2011 Investigation and assessment of drain and sewer systems outside buildings - Part 2: Visual inspection coding system; German version EN 13508-2:2003+A1:2011