Home / Standards / GB/T 17804-2009 GB/T 17804-2009 Active Reciprocating internal combustion engines - Graphical symbols 往复式内燃机 图形符号 Standard Type GBT ICS 27.020 CCS J90 Status 现行 Issue Date 2009-03-19 Implementation 2009-11-01 Responsible Dept 中国机械工业联合会 Drafting Unit 中国机械工业联合会