International Electrotechnical Commission <br/><br/>
IEC: 60076-21-2012/IEEE C57.15; Power transformers - Part 21 - Standard requirements, terminology, and test code for step voltage regulators 

 - 1.0 
 - Geneva  International Electrotechnical Commission  2011 
 - X+93+4 
<br/><br/> Print out taken from CD 
<br/><br/><label>Universal Decimal Class. No.: </label> /