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DIN ISO 13715:2018
Technical product documentation - Edges of undefined shape - Indication and dimensioning (ISO 13715:2017)
This document specifies rules for the indication and dimensioning of undefined edges in technical product and dimensions. The proportions and dimensions of the graphical symbols to be used are also specified. In cases where the geometrically defined shape of an edge (for example, 1 × 45°) is required, the general dimensioning principles given in ISO 129-1 apply.
Deutsches Institut für Normung [din]