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IEC 80416-3 Ed. 1.0 b:2002
Basic principles for graphical symbols for use on equipment - Part 3: Guidelines for the application of graphical symbols
Provides guidelines for the application of graphical symbols for use on equipment in order to maintain visual clarity and overall consistency when such graphical symbols are applied. It stipulates the permissible extent by which a symbol original may be modified in reproduction for actual use on equipment
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International Electrotechnical Commission [iec]