Home / Standards / GB/T 13987-1992 GB/T 13987-1992 Abolished Determination of flash guide numbers for electronic photoflash equipment 照相用电子闪光装置闪光指数的确定 Standard Type GBT ICS 37.040.10 CCS N46 Status 废止 Issue Date 1992-12-19 Implementation 1993-07-01 Responsible Dept 中国机械工业联合会 Drafting Unit N/A