ISO 6428:1982 Preview
Technical drawings -- Requirements for microcopying
This standard was last reviewed and confirmed* in 2011.
*Therefore this version remains current
The rules of ISO 128, ISO 3098, ISO 5457 are expanded. The requirements will provide for high quality microforms with which legible enlargement copies can be made, and documents complying with them can also be reproduced by any other reprographic system. It is recommended that all drawing office documents be executed in accordance with this International Standard.