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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