This standard specifies the basic requirements for microcopied originals (technical drawings and technical documents). This standard applies to technical drawings and technical documents before microfilming. The scientific and technical literature can also be used as a reference.
GB/T 10609.4-1989 history
2009GB/T 10609.4-2009 Technical drawings.Requirements for microcopying
1989GB/T 10609.4-1989 Technical drawings--Requirements for microcopying