Ferrite cores - guide on the limits of surface irregularities - part 4 : ring - cores 铁氧体磁心.表面不规则性限值的指南.第4部分:环形芯
2.
Ferrit cores - guide on the limits of surface irregularities - part 4 : ring - cores iec 60424 - 4 : 2001 ; german version en 60424 - 4 : 2001 铁氧体磁芯.表面不规则性指南.第4部分:环芯