AKKINSON, J <br/><br/>
TELEPHONY A DETAILED EXPOSITION OF THE TELEPHONE EXCHANGE SYSTEMS OF THE BRITISH POST OFFICE 

 - VOL-II 
 - LONDON  PITMAN  1990 
<br/><br/><label>ISBN: </label>0-273-43181-1 
<br/><br/><label>Dewey Class. No.: </label>621.385 ATK'T