|
US5357560A
|
|
Adaptable alarm interface unit for use with electronic automobile alarm systems and the like
|
|
US5315285A
|
|
Alarm system for sensing and vocally warning a person approaching a protected object
|
|
US5117217A
|
|
Alarm system for sensing and vocally warning a person to step back from a protected object
|
|
US4987402A
|
|
Alarm system for sensing and vocally warning of an unauthorized approach towards a protected object or zone
|
|
US4897630A
|
|
Programmable alarm system having proximity detection with vocal alarm and reporting features
|
|
US4794368A
|
|
Programmable automobile alarm system having vocal alarm and reporting features
|
