Home / Standards / GB/T 28248-2012 GB/T 28248-2012 Active Cemented carbide drills for printed boards 印制板用硬质合金钻头 Standard Type GBT ICS 25.100.30 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