Home / Standards / GB/T 1139 GB/T 1139 Active Morse and metric taper reamers 莫氏圆锥和米制圆锥铰刀 Standard Type GBT ICS 25.100.30 CCS J41 Status 现行 Issue Date 2017-02-28 Implementation 2017-09-01 Responsible Dept 中国机械工业联合会 Drafting Unit 中国机械工业联合会