International electrotechnical vocabulary:   Signalling and security apparatus for railways, group 31 

 - 2nd ed.  
 - Geneva:   Central Office of the I. E. C.,   1963 
 - 106p.  
 - International electrotechnical commission  .
<br/><br/><label>Subjects--Topical Terms: </label><br/>Electronics 
<br/><br/><label>Subjects--Index Terms: </label>Technology  
<br/><br/><label>Universal Decimal Class. No.: </label>R 621.3(038)=00  / K3.31