Home / Standards / GB/T 17739.2-2021 GB/T 17739.2-2021 Active Microfilming of technical drawings and other drawing office documents—Part 2：Quality criteria and control of 35mm silver gelatin microfilms 技术图样与技术文件的缩微摄影 第2部分: 35mm银-明胶型缩微品的质量准则与控制 Standard Type GBT ICS 37.080 CCS A14 Status 现行 Issue Date 2021-05-21 Implementation 2021-12-01 Responsible Dept 国家标准委 Drafting Unit N/A