BPB Editorial Board <br/><br/>
Build your own intercoms / 
BPB Editorial Board 
 - 44 p. : ill. ; 22 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Intercom<br/>Intercom Systems
<br/><br/><label>Dewey Class. No.: </label>621.382