Povey, P. J. <br/><br/>
The telephone and the exchange / 
P. J. Povey. 
 - Revision edition. 
 - London :  Pitman Pub.,  1979. 
 - 124 pages :  illustrations ;  25 cm. 
<br/><br/> A revised edition of the book published in Great Britain by The Post Office, 1974. 
<br/><br/><label>ISBN: </label>0273013556 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Telephone.<br/>Telephone systems.