IEC: 517 - 1975 (Amendment No.1 - 1977); High-voltage metal-enclosed switchgear for rated voltages of 72.5kV and above

IEC: 517 - 1975 (Amendment No.1 - 1977); High-voltage metal-enclosed switchgear for rated voltages of 72.5kV and above - Geneva IEC 1977 - 5p

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