Home / Standards / GB/T 21943-2008 GB/T 21943-2008 Active Back-up pads for vulcanized fibre discs 钢纸砂盘支撑托盘 Standard Type GBT ICS 25.100.70 CCS J43 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 中国机械工业联合会