2016SJ/T 3172.4-2016 Dimensions of ferrite cores Part 4: RM type cores and accessories
2002SJ/T 2744-2002 Dimensions of spuare cores (RM cores) made of magnetic oxides and associated parts
1970SJ 2744-1987 Dimensions for square cores (RM-cores) made of magnetic oxides and for their associated parts
SJ 2744-1987 Dimensions for square cores (RM-cores) made of magnetic oxides and for their associated parts was changed to SJ/T 2744-2002 Dimensions of spuare cores (RM cores) made of magnetic oxides and associated parts.