TY  - GEN
AU  - Leo G. Sands
TI  - Electronic security systems
SN  - 0672232057
U1  - 621.38928,SAN 
PY  - 1973///
CY  -  Indianapolis
PB  - Ind., T. Audel
KW  - Leo G. Sands
KW  - Electronic security systems
N1  - Scope and application of security systems (Page-7), Switches and relays (Page-15), Sensors and encoders (Page-41), Indicators and alarms (Page-98), Electrical control and alarm circuits (Page-117), Electronic control and alarm circuits (Page-133), Security communications (Page-145), Closed circuits television (Page-187), Transmission media (Page-213), Transmission system installation (Page-239)
ER  -