Home / Standards / GB/T 12822-1991 GB/T 12822-1991 Abolished Geometric conditions for photographic reflection density measurement 摄影反射密度测量的几何条件 Standard Type GBT ICS 37.040 CCS A50 Status 废止 Issue Date 1991-04-30 Implementation 1992-03-01 Responsible Dept 中国石油和化学工业联合会 Drafting Unit N/A