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ISO 3098-5:1997
Technical product documentation -- Lettering -- Part 5: CAD lettering of the Latin alphabet, numerals and marks
This part of ISO 3098 specifies the general requirements for computer-aided design and draughting (CADD) lettering, in accordance with all other parts of this International Standard, to be used in technical product documentation (in particular on technical drawings).
It includes basic conventions as well as rules for the application of CAD lettering using the techniques of numerically controlled lettering and draughting systems.
International Organization for Standardization [iso]

