Home / Standards / GB/T 28252-2012 GB/T 28252-2012 Active Hobs for pre-grinding gear 磨前齿轮滚刀 Standard Type GBT ICS 25.100 CCS J41 Status 现行 Issue Date 2012-03-09 Implementation 2012-07-01 Responsible Dept 中国机械工业联合会 Drafting Unit 中国机械工业联合会