Home / Standards / GB/T 21220-2007 GB/T 21220-2007 Abolished Soft magnetic metallic materials 软磁金属材料 Standard Type GBT ICS 29.030 CCS K14 Status 废止 Issue Date 2007-12-03 Implementation 2008-05-20 Responsible Dept 中国电器工业协会 Drafting Unit N/A