Home / Standards / GB/T 21955-2008 GB/T 21955-2008 Active Tractors and machinery for agriculture and forestry - Paper friction disc - Technical specifications 农林拖拉机和机械 纸基摩擦片 技术条件 Standard Type GBT ICS 65.060.10 CCS T63 Status 现行 Issue Date 2008-06-03 Implementation 2009-01-01 Responsible Dept 中国机械工业联合会 Drafting Unit N/A