Spectrum analysis instruments 

 - Moscow :  [S.n.],  [195?] 
 - 114 p. : il. ;  26,5 cm. 
<br/><br/><label>Standard No.: </label>DAR-M3614 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Fotografía
<br/><br/><label>Universal Decimal Class. No.: </label>77