Trimmer, William H <br/><br/>
Understanding and servicing alarm systems/ 
H.William Trimmer 
 - Third Edition 
 - Boston:  Butterworth Heinemann,  1999. 
 - xi, 255 pages :  illustrations ;  15 cm. 
<br/><br/> Includes index 
<br/><br/><label>ISBN: </label>9780750672061 (hardback) 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Burglar alarms<br/>Fire alarms