Home / Standards / GB/T 7177-1987 GB/T 7177-1987 Abolished Double disc surface grinding machines--Parameters 双端面磨床参数 Standard Type GBT ICS 25.080.50 CCS J55 Status 废止 Issue Date 1987-01-10 Implementation 1987-10-01 Responsible Dept 中国机械工业联合会 Drafting Unit N/A