Philips Telecommunication Review. 

 - Hilversum :  N.V.Philips Telecommunicatie Industrie,  1967. 
 - v. :  gráficos.,fotos ;  29 cm. 
<br/><br/>V.27 N.1 Measuring equipment for data transmission channels. The ES series of semi-and fully automatic telegraph message-switching centres. Landmarks in the development of an industry.