The new Classroom Intruder Cylinder Lock from PDQ enables school staff members to check the locked/unlocked status of a door with an LED indicator, avoiding the need to open the door in order to check the outside lever.
http://www.prweb.com/releases/2013/10/prweb11263616.htm
http://www.prweb.com/releases/2013/10/prweb11263616.htm
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