Home / Standards / GBT 1239.1-2009 GBT 1239.1-2009 Cold coiled helical springs technical specifications — Part 1: Extension springs 冷卷圆柱螺旋弹簧技术条件 第1部分:拉伸弹簧 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