IEC: 56 - 5 - 1971 (Amendment No.2 - 1981); High-voltage alternating-Current circuit-breakers 5 rules for the selection of circuit-breakers for service

IEC: 56 - 5 - 1971 (Amendment No.2 - 1981); High-voltage alternating-Current circuit-breakers 5 rules for the selection of circuit-breakers for service - Geneva IEC 1981 - 2p

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