Smith, Sydney F. <br/><br/>
Telephony & telegraphy A:  an introduction to telephone and telegraph instruments and exchanges, /  [Book :] 
by Sydney F. Smith. 
 - 1st.ed. 
 - London, :  Oxford U.P.,  1969. 
 - xv, 285 p. :  illus. ;  25 cm. 
<br/><br/> Third ed. published in 1978 under title: Telephony and telegraphy. 
<br/><br/>Bibliography: p. [263]. 
<br/><br/> All age. 
<br/><br/><label>ISBN: </label>0198593058 
<br/><br/><label>LCCN: </label>70436707  
<br/><br/><label>Nat. Bib. No.: </label>B69-20604 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Telephone.<br/>Telegraph.
<br/><br/><label>LC Class. No.: </label>TK6161  / .S6 
<br/><br/><label>Dewey Class. No.: </label>621.38