Report of radio research in Japan 

 - Tokyo :  National Research Council of Japan,  ? -  
 - v. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>RADIO<br/>EQUIPO DE RADIO<br/>ELECTRICIDAD<br/>EMISIONES DE RADIO
<br/><br/><label>Universal Decimal Class. No.: </label>621.3