1995IEC 60431/AMD1:1995 Dimensions of square cores (RM cores) made of magnetic oxides and associated parts; Amendment 1
1983IEC 60431:1983 Dimensions of square cores (RM-cores) made of magnetic oxides and associated parts
IEC 60431:1983 Dimensions of square cores (RM-cores) made of magnetic oxides and associated parts was changed to IEC 62317-4:2005 Ferrite cores - Dimensions - Part 4: RM-cores made of ferrite and associated parts.