Home / Standards / JB/T 8247.2-1995 JB/T 8247.2-1995 Active 照相镜头光圈标记 Standard Type JB ICS N/A CCS N/A Status Active Issue Date 1996-04-14 Implementation 1996-04-14 Centralized Committee 机械工业部 Issuing Authority 机械工业部