Doorknob Retracts When Locked

http://www.geekologie.com/2007/07/the_doorknob_condition_ensures.php

Designer Arnaud Lapierre decided that wasn’t enough, so he put together the Doorknob Condition, which is a doorknob that uses a pulley system to retract the entire doorknob, preventing anybody from getting in without breaking down the door.


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