Hayes, M. E.  <br/><br/>
Current-colleting in electrical machines 

 - London :   I.Pitman,   1947. 
 - 191 p. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>MAQUINAS ELECTRICAS<br/>ESCOBILLAS DE CARBON
<br/><br/><label>Universal Decimal Class. No.: </label>621.313