IEC: 517 - 1990 (Amendment No.1 - 1994); Gas-insulated metal-enclosed switchgear for rated voltages of 72,5kV and above

IEC: 517 - 1990 (Amendment No.1 - 1994); Gas-insulated metal-enclosed switchgear for rated voltages of 72,5kV and above - Geneva IEC 1994 - 7p

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