1、 IEC 60424-4 Edition 2.0 2015-12 INTERNA TIONAL STA NDA RD NORME INTERNA TIONALE Ferrite cores Guidelines on the limits of surface irregularities Part 4:Ring-cores Noyaux ferrites Lignes directrices relativ es aux limites des irrgularits de surface Partie 4:Noy aux toriques IEC 60424-4:2015-12(en-fr
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