Home / Standards / GB/T 4028-2013 GB/T 4028-2013 Active Symbolization of control positions for timekeeping instruments 计时仪器的检验位置标记 Standard Type GBT ICS 39.040.01 CCS Y11 Status 现行 Issue Date 2013-12-17 Implementation 2014-12-01 Responsible Dept 中国轻工业联合会 Drafting Unit N/A