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Wall-mounted electromagnetic door holder securing a door in the open position. An electromagnetic door holder (electromagnetic door holder and release or hold-open device, sometimes informally called a mag hold open or electric doorstop) is a simple electromechanical mechanism which can be used to hold a fire door or security door open until given a signal to release.
The most remarkable is the shear lock, where the armature does not directly pull off the face, but the load is instead in shear, like a mechanical stop. The shear magnetic lock allows a door to swing in both directions, as opposed to the original (and now ubiquitous) direct pull type, which normally works either in an in-swing or out-swing ...
How It's Made is a documentary television series that premiered on January 6, 2001, on the Discovery Channel in Canada and Science in the United States. The program is produced in the Canadian province of Quebec by Productions MAJ, Inc. and Productions MAJ 2.
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The system had a protective electric loop for windows and doors. A break-in and cutting wires would cause an alarm to sound. The device operated on a 12-volt battery and included extra loud "B" bell, heavy-duty weather-resistant cabinet with built-in tamper resistant circuit, 125' of double stranded wire, six sets of magnetic switches, two keys ...