Engineer Steven Negedly from Orlando Fire Dept Engine Company 9 sent in these photos of a new locking system he found during a pre-fire plan of a new big box store in his area. This system is called the Positive Lock system. From the outside, the only indication of it presence is the four carriage bolts and the lock cylinder in the middle of the door. Click here to see the supplemental page with the details and more pictures.
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Positive Lock System
