Home / Standards / GB/T 4681-2007 GB/T 4681-2007 Abolished External cylindrical centreless grinding machines - Testing of the accuracy 无心外圆磨床 精度检验 Standard Type GBT ICS 25.080.50 CCS J55 Status 废止 Issue Date 2007-07-26 Implementation 2007-12-01 Responsible Dept 中国机械工业联合会 Drafting Unit 中国机械工业联合会