Home / Standards / GB/T 2490-2007 GB/T 2490-2007 Abolished Bonded abrasive products - Hardness grade measurement 固结磨具 硬度检验 Standard Type GBT ICS 25.100.70 CCS J43 Status 废止 Issue Date 2007-06-25 Implementation 2007-11-01 Responsible Dept 中国机械工业联合会 Drafting Unit N/A