[国外标准] JIS C2569-1998 Ring cores made of ferromagnetic oxide
[国外标准] JIS C2560-3-1-2006 Cores made of ferrite-Part 3-1：Dimensions and surface irregularities-E cores
[国外标准] JIS C2560-2-2006 Cores made of ferrite-Measuring methods
[国外标准] JIS C2516-1990 Pot-cores made of ferromagnetic oxide