Atkinson, J.  <br/><br/>
Telephony : a detailed exposition of the telephone exchange systems of the British Post Office. Vol. 2  (Book) 

 - London  Sir Isaac Pitman  1950 
 - 873 p.  26 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Telephone--Great Britain
<br/><br/><label>Universal Decimal Class. No.: </label>621.395 ATK  / 10616