Jolley, E H <br/><br/>
Introduction to telephony and telegraphy 

 - Allahabad  Wheeler  1992 
 - x, 413p.  
<br/><br/> Includes index 
<br/><br/><label>ISBN: </label>8185614369 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Digital telephone signalling<br/>Telegraphy<br/>Telephone signalling codes -- Digital<br/>Telephony<br/>Traffic and Trunking -- Telephone traffic