Home / Standards / GB/T 21020-2007 GB/T 21020-2007 Active Metal cutting tools - Terms in circular screwing dies 金属切削刀具 圆板牙术语 Standard Type GBT ICS 25.100.50 CCS J41 Status 现行 Issue Date 2007-07-26 Implementation 2007-12-01 Responsible Dept 中国机械工业联合会 Drafting Unit N/A