M00009102
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ISO 128-21:1997 [ Withdrawn ] Technical drawings -- General principles of presentation -- Part 21: Preparation of lines by CAD systems
standard by International Organization for Standardization, 03/01/1997
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Availability date: 2021-11-25
Specifies procedures for the calculation of the most important basic types of non-continuous lines according to ISO 128-20 and their line elements.