Home / Standards / GB/T 3164-2007 GB/T 3164-2007 Active Vacuum technology - Graphical symbols 真空技术 图形符号 Standard Type GBT ICS 23.160 CCS J78 Status 现行 Issue Date 2007-12-20 Implementation 2008-06-01 Responsible Dept 中国机械工业联合会 Drafting Unit N/A