75548334
Sep 3, 1998
Feb 15, 2000
VISUAL CALL PLACEMENT AND STATUS COMMUNICATION SYSTEM COMPRISED OF - (1) CENTRALLY LOCATED VISUAL PANEL; (2) INDIVIDUAL CALL AND STATUS UNITS; (3) INDIVIDUAL EMERGENCY CALL DEVICES; AND (4) INDIVIDUAL CORRIDOR DOME LIGHTS, FOR THE PURPOSE OF IDENTIFYING CALL PLACEMENT AND STATUS OF USER
Electrical and Scientific Apparatus