Home / Standards / GB/T 12761-2010 GB/T 12761-2010 Abolished Raise-boring machines 天井钻机 Standard Type GBT ICS 73.100.30 CCS D91 Status 废止 Issue Date 2010-12-01 Implementation 2011-03-01 Responsible Dept 中国机械工业联合会 Drafting Unit N/A