More IEC standard pdf
IEC 60519-7 Ed. 1.0 b:1983
Safety in electroheat installations. Part 7: Particular requirements for installations with electron guns
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IEC 60767 Ed. 1.0 b:1983
Helical-scan video-tape cassette system using 12.65 mm (0.5 in) magnetic tape on type beta-format
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IEC 60744 Ed. 1.0 b:1983
Safety logic assemblies of nuclear power plants - Characteristics and test methods
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