Home / Standards / GB/T 20428-2006 GB/T 20428-2006 Active Granite surface plates 岩石平板 Standard Type GBT ICS 17.040.30 CCS J42 Status 现行 Issue Date 2006-07-05 Implementation 2006-12-01 Responsible Dept 中国机械工业联合会 Drafting Unit N/A