Copper for Earthing 

 - 4th ed. 
 - Herts :   Copper Development Association,  1950  
<br/><br/><label>Standard No.: </label>DEX-M4784 
<br/><br/><label>Subjects--Topical Terms: </label><br/>PROTECCIÓN<br/>RESISTENCIA<br/>COBRE
<br/><br/><label>Universal Decimal Class. No.: </label>669.37