Home / Standards / GB/T 12761-2025 GB/T 12761-2025 Active Raise-boring machines 天井钻机 Standard Type GBT ICS 73.100.30 CCS D91 Status 现行 Issue Date 2025-05-30 Implementation 2025-12-01 Responsible Dept 中国机械工业联合会 Drafting Unit N/A