Bush, Stanley E.  <br/><br/>
Private Branch Exchange Systems and Applications 
Stanley E. Bush and Charles R. Parsons 
 - New York:  McGraw Hill,  1993. 
 - x, 192p. 
<br/><br/> HB 
<br/><br/><br/>Eng 
<br/><br/><label>ISBN: </label>007007062 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Telephone-Private branch exchanges
<br/><br/><label>Dewey Class. No.: </label>621.385  / BUP