Smith, Sydney F. <br/><br/>
Telephony and telegraphy :  an introduction to instruments and switching systems (electromechanical and reed-electronic) / 
Sydney F. Smith. 
 - 3rd ed. 
 - Oxford ;  New York :  Oxford University Press,  1978. 
 - xiv, 278 p. :  ill. ;  26 cm. 
<br/><br/>Telephone and Teleprinters (Page-1), Relays (Page-29), Signaling (Page-58), Switching Systems (Page-80), Strower Systems-Selector Mechanism (Page-115), Strower System-Selector Circuits (Page-140), Traffic and Trunking (Page-173), Distribution Farms (Page-205), Exchange Power Plant (Page-221). 
<br/><br/><label>ISBN: </label>0198593589 :  0198593570 
<br/><br/><label>LCCN: </label>78318256 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Telegraph.<br/>Telephone.
<br/><br/><label>Dewey Class. No.: </label>621.385,SMI