73680795
Aug 21, 1987
May 3, 1988
ELECTRONIC DOOR CONTROL FOR DELAYING AND/OR SEQUENCING, MANUAL STATION DOOR CONTROL, DOOR CONTROL AND MONITORING PANELS, KEY SWITCH KEY PAD SWITCHES, MAGNETIC CARD READERS, MOTION DETECTORS, DOOR POSITION SWITCHES, VISUAL AND AUDIBLE ENUNCIATORS, POWER SUPPLIES AND BATTERY BACK-UPS FOR POWER SUPPLIES
Electrical and Scientific Apparatus