Sher, A. H. <br/><br/>
Selection and application guide to commercial intrusion alarm system / 
by A. H. Sher 
 - Washington, D.C. :  United States Government Printing Office,  1979 
 - iii, 36 p. :  ill. ;  31 cm. 
<br/><br/> Law enforcement equipment technology 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Public address systems<br/>Theaters--Electronic sound control
<br/><br/><label>Dewey Class. No.: </label>621.3892