Here's a selection of relevant articles about card key from AEC companies and organizations, including Corkey Control Systems Inc.
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CorKey Control Systems Products Page
...the lock is returned to unlocked mode; so the door cannot be left unlocked by a user. Unlocking key allows door to be left unlocked. more>> 300 Series 300 Series: The original Card Key Lock of the 1940's was a Card-Operated electric switch and there is much demand for these models today in Alarm Systems; to actuate electric door releases;... See #1.
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