IEC: 56 - 6 - 1971 (Amendment No.2 - 1981); High-voltage alternating-Current circuit-breakers 6 Information to be given with enquiries, tenders and orders and rules for transport, erection and maintenance 

 - Geneva  IEC  1981 
 - 2p 
<br/><br/><label>Universal Decimal Class. No.: </label> /