Meyer Erwin <br/><br/>
Electro-acoustics 

 -  1939 
 - p.  cm. 
<br/><br/><label>Standard No.: </label>74463 
<br/><br/><label>Source: </label> Textual 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Telephony
<br/><br/><label>Dewey Class. No.: </label>D66:48, G9;1