Home / Standards / GB/T 9634.4-2007 GB/T 9634.4-2007 Active Ferrite cores-Guide on the limits of surface irregularities - Part 4: Ring-cores 铁氧体磁心表面缺陷极限导则 第4部分：环形磁心 Standard Type GBT ICS 29.100.10 CCS L19 Status 现行 Issue Date 2007-02-09 Implementation 2007-09-01 Responsible Dept 工业和信息化部（电子） Drafting Unit N/A