2016DIN EN 60424-8:2016 Ferrite cores - Guidelines on the limits of surface irregularities - Part 8: PQ-cores (IEC 60424-8:2015); German version EN 60424-8:2015
1970DIN EN 60424-8 E:2014-02 Ferrite cores - Guidelines on the limits of surface irregularities - Part 8: PQ-cores