Home / Standards / GB/T 13843-1992 GB/T 13843-1992 Abolished Polished monocrystalline sapphire substrates 蓝宝石单晶抛光衬底片 Standard Type GBT ICS N/A CCS L90 Status Abolished Issue Date 1992-12-28 Implementation 1993-08-01 Centralized Committee 国家标准委 Issuing Authority 国家标准委