Tilbaketrukket
NS-EN 347:1992
NS-EN 347:1992/A1:1997
NS-EN 347-2:1996
NS 2939:1985
NS-EN ISO 20347:2004
NS-EN ISO 20347:2004/AC:2007
NS-EN ISO 20347:2004/A1:2007
NS-EN ISO 20347:2012