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Electronic doorman

Based on a Labs project | October 2011 | Find it here
Electronic doorman
The electronic doorman enables a door to be opened automatically after a predefined delay from the moment a bell has been rung. It is intended for use in, for instance, waiting rooms and offices. The idea behind it is that the person who normally operates the door-opening control on his/her desk need not interrupt his/her work to open the door to visitors, partners or clients.
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