TY  - GEN
AU  - Schum,John L.
TI  - Electronic locking devices
SN  - 0409901253
U1  - 621.3,SCH 
PY  - 1988///
CY  - Boston
PB  - Butterworths
KW  - Electronic locking devices
N1  - Why Electric Hardware (Page-1),The Basic Circuit (Page-13), The Load (Page-23), Electronic Locking Devices (Page-27), The Power Source (Page-71), The Control (Page-103), Monitoring Devices (Page-139), Building a Systems (Page-159), Troubleshooting (Page-193)
ER  -