Home / Standards / GB/T 1315-1977 GB/T 1315-1977 Abolished Thin-film coatings on optical parts--Classification， symbols and designations 光学零件薄膜的分类、符号及标注 Standard Type GBT ICS 37.020 CCS N30 Status 废止 Issue Date 1977-02-26 Implementation 1978-01-01 Responsible Dept 中国机械工业联合会 Drafting Unit N/A