![](4.gif) | Canadian Standards Association | Canada |
![](ansi.gif) | American National Standards Institute | United States |
![](ASSE.gif) | American Society of Safety Engineers | United States |
![](6.gif) | Water Research Council | United Kingdom |
![](7.gif) | Office of the Water Authority | Hong Kong |
![](5.gif) | Kiwa N.V. | Netherlands |
![](3.gif) | Public Utilities Board | Singapore |
![](2.gif) | Bereich Umweltschutz Schallschutz und Technische Akustik | Germany |
![](1.gif) | VÝZKUMNÝ ÚSTAV POZEMNÍCH STAVEB PRAHA | Cheks Rep. |
. | Norges byggforskningsinstitutt | Norway |
. | Marque Nationale NF Association Francais de Normalisation | France |
. | Turkish Standards Institution | Turkey |
. | The Standards Institution of Isreal | Isreal |