Home / Standards / GB/T 28251-2012 GB/T 28251-2012 Active The technical specifications for timing belt wheel hobs and timing belt mold hobs 带轮滚刀和带模滚刀 技术条件 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 N/A