Inventor
BEIGEL BRUCE G
US3 patents
Patents
3 patentsUS4720128AJan 19, 1988
Magnetic emergency exit door lock with time delay
RELIABLE SECURITY SYST73 citations94
US4652028AMar 24, 1987
Magnetic emergency exit door lock with time delay
RELIABLE SECURITY SYST76 citations94
US4703962ANov 3, 1987
Magnetic door lock with time delay option
RELIABLE SECURITY SYST66 citations91