Brown, C W. <br/><br/>
Automatic telephony simplified : 

 - London :  Isaac Pitman and Sons,  1928. 
 - viii, 168 p. :  ill. ;  18 cm. 
<br/><br/> Includes index. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Automatic telephony<br/>Telephone systems<br/>Crossbar systems
<br/><br/><label>Dewey Class. No.: </label>621.3857  / BRO