Home / Standards / GBT 4459.8-2009 GBT 4459.8-2009 Mechanical drawings—Dynamic sealing rings—Part 1: General simplified representation 机械制图 动密封圈 第1部分:通用简化表示法 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