Home / Standards / GB/T 17421.4-2016 GB/T 17421.4-2016 Active Test code for machine tools—Part 4: Circular tests for numerically controlled machine tools 机床检验通则 第4部分:数控机床的圆检验 Standard Type GBT ICS 25.040.20 CCS J50 Status 现行 Issue Date 2016-04-25 Implementation 2016-11-01 Responsible Dept 中国机械工业联合会 Drafting Unit N/A