73726418
May 4, 1988
Feb 28, 1989
ELECTRONIC CONTROLS FOR REMOTELY OPENING AND CLOSING GARAGE DOORS AND FOR OPERATING SLIDE AND SWING GATES, OVERHEAD GATES AND BARRIER GATES; SYSTEMS FOR CONTROLLING ACCESS TO APARTMENT COMPLEXES, INDUSTRIAL SITES, AND OTHER SECURE AREAS, COMPRISING ENCODED CARDS, ELECTRONIC CARD READERS AND VERIFIERS, LOG PROCESSOR FOR PROVIDING DAILY LOGS OF PERSONS HAVING ACCESS TO SECURED AREAS, AND MAGNETIC DETECTORS FOR DETECTING APPROACHING VEHICLES
Electrical and Scientific Apparatus