Revised
IEC 60900:1987 ED1
IEC 60900:1987/AMD1:1995 ED1
IEC 60900:1987/AMD1:1995/COR1:2000 ED1
IEC 60900:1987/AMD2:2002 ED1
IEC 60900:2004 ED2
IEC 60900:2012 ED3