BRITISH STANDARDS INSTITUTION <br/><br/>
BS EN: 60255-23-1997,IEC 60255-23:1994: Electrical Relays,part 23: Contact performance. 

 - London  BSI  1997 
 - 38 
<br/><br/><label>ISBN: </label>0-580-27377-6 
<br/><br/><label>Universal Decimal Class. No.: </label> /