Home / Standards / GB/T 17421.4-2003 GB/T 17421.4-2003 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 N/A CCS N/A Status N/A Issue Date N/A Implementation N/A Responsible Dept N/A Drafting Unit N/A