Darr, Jack. <br/><br/>
How to install & service intercommunication systems / 
by Jack Darr. 
 - New York :  J. F. Rider,  1957 [reprinted 1957]. 
 - vii, 151 p. :  ill.;  22 cm. 
 - A Rider publication,  no. 189 .
<br/><br/>Includes index. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Intercommunication systems.
<br/><br/><label>Dewey Class. No.: </label>621.3853  / DAH 1966