Home / Standards / GB/T 4247-2017 GB/T 4247-2017 Active Machine bridge reamers with Morse taper shanks 莫氏锥柄机用桥梁铰刀 Standard Type GBT ICS 25.100.30 CCS J41 Status 现行 Issue Date 2017-12-29 Implementation 2018-07-01 Responsible Dept 中国机械工业联合会 Drafting Unit N/A