GB/T 17739.6-2002 Microfilming of technical drawings and technical documents Part 6: Quality criteria and control of systems for enlargements from 35mm microfilm (English Version)
2012GB/T 17739.6-2012 Microfilming of technical drawings and other drawing office documents.Part 6:Quality criteria and control of systems for enlargements from 35 mm microfilm
2002GB/T 17739.6-2002 Microfilming of technical drawings and technical documents Part 6: Quality criteria and control of systems for enlargements from 35mm microfilm