Home / Standards / GB/T 21951-2008 GB/T 21951-2008 Abolished Cubic boron nitride inserts,tipped or solid - Dimensions 镶或整体立方氮化硼刀片 尺寸 Standard Type GBT ICS 25.100.01 CCS J41 Status 废止 Issue Date 2008-06-03 Implementation 2009-01-01 Responsible Dept 中国机械工业联合会 Drafting Unit 中国机械工业联合会