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Graphical symbols. Safety colours and safety signs. Colorimetric and photometric properties of safety sign ma…

Graphical symbols — Safety colours and safety signs — Part 4: Colorimetric and photometric properties of safe…

Overview ISO 3864-4:2011 - Graphical symbols - Safety colours and safety signs - Part 4: Colorimetric and photometric properties of safety sign materials - defines the colour and light‑related (photo…