Home / Standards / GB/T 7660.1-1987 GB/T 7660.1-1987 Abolished Reflecting prisms--Optical axis， length of optical axis，axial section and optical parallelism 反射棱镜 光轴、光轴长度、光轴截面与光学平行度 Standard Type GBT ICS 37.020 CCS N30 Status 废止 Issue Date 1987-04-17 Implementation 1988-01-01 Responsible Dept 中国机械工业联合会 Drafting Unit N/A