Home / Standards / GBT 4459.9-2009 GBT 4459.9-2009 Mechanical drawings—Dynamic sealing rings—Part 2: Simplified representation of features 机械制图 动密封圈 第2部分:特征简化表示法 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