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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