DIN EN 60424-4:2016 Ferrite cores - Guidelines on the limits of surface irregularities - Part 4: Ring-cores (IEC 60424-4:2015); German version EN 60424-4:2016
2016DIN EN 60424-4:2016 Ferrite cores - Guidelines on the limits of surface irregularities - Part 4: Ring-cores (IEC 60424-4:2015); German version EN 60424-4:2016
2001DIN EN 60424-4:2001 Ferrit cores - Guide on the limits of surface irregularities - Part 4: Ring-cores (IEC 60424-4:2001); German version EN 60424-4:2001