Bellamy, John C. <br/><br/>
Digital telephony   [Book] 
John C. Bellamy. 
 - 3rd Ed. 
<br/><br/> All. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Digital Telephone Systems
<br/><br/><label>Dewey Class. No.: </label>621.385