TY  - BOOK
AU  - Sher,A.H.
ED  - United States.
TI  - Selection and application guide to commercial intrusion alarm system
U1  - 621.3892 
PY  - 1979///
CY  - Washington, D.C.
PB  - United States Government Printing Office
KW  - Public address systems
KW  - Theaters
KW  - Electronic sound control
N1  - Law enforcement equipment technology
ER  -