Smith Sydney F <br/><br/>
Telephony & telegraphy A :   an introduction to telephone and telegraph instruments and exchanges / 
Sydney F. Smith. 
 - London :  Oxford U.P.,   1969. 
 - xv, 285 p.   illus.    25 cm. 
<br/><br/>Includes bibliographical references 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Telephone<br/>Telegraph
<br/><br/><label>LC Class. No.: </label>TK6161  
<br/><br/><label>Dewey Class. No.: </label>621.38