Photographic sound recording and reproduction 

 - London:  BKSTS,  1975. 
 - Various pages 
<br/><br/> PB 
<br/><br/><br/>eng 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Sound-Recording and reproducing<br/>Optical communications
<br/><br/><label>Dewey Class. No.: </label>778.5344  / PHO