Home / Standards / GB/T 7660.2-1987 GB/T 7660.2-1987 Abolished Reflecting prisms--Classification，code name and chart 反射棱镜 分类、代号与图表 Standard Type GBT ICS 37.020 CCS N30 Status 废止 Issue Date 1987-06-20 Implementation 1988-01-01 Responsible Dept 中国机械工业联合会 Drafting Unit N/A