Home / Standards / GB/T 6078-2016 GB/T 6078-2016 Active Centre drills 中心钻 Standard Type GBT ICS 25.100.30 CCS J41 Status 现行 Issue Date 2016-02-24 Implementation 2016-09-01 Responsible Dept 中国机械工业联合会 Drafting Unit N/A