IEC 60417C:1977 Graphical symbols for use on equipment. Index, survey and compilation of the single sheets; 3rd Supplement was changed to IEC 60417-2:1998 Graphical Symbols for Use on Equipment - Part 2: Symbol Originals (Edition 1.0; Amendment 1 10-2000).
IEC 60417C:1977 Graphical symbols for use on equipment. Index, survey and compilation of the single sheets; 3rd Supplement was changed to IEC 60417-1:1998 Graphical symbols for use on equipment - Part 1: Overview and application.
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