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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 vault door had a magnetic lock that consisted of two plates - when armed, they would trigger a magnetic field and when the door opened, the field would break, triggering an alarm. One of the perpetrators who was nicknamed “The Genius” overcame this by using a custom-made aluminium plate, to which he attached heavy-duty double-sided ...
The principle behind an electromagnetic lock is the use of electromagnetism to lock a door when energized. The holding force should be collinear with the load, and the lock and armature plate should be face-to-face to achieve optimal operation. The magnetic lock relies upon some of the basic concepts of electromagnetism.
This is an accepted version of this page This is the latest accepted revision, reviewed on 16 February 2025. Device to open or close door Various examples of door handles throughout history A door handle or doorknob is a handle used to open or close a door. Door handles can be found on all types of doors including: exterior doors of residential and commercial buildings, internal doors ...
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The 1960s Cadillac Fleetwood came standard with power front and rear vent windows, in addition to standard power side windows, for a total of eight power window controls on the driver's door panel. Modern heavy-duty highway tractors frequently have an option for power window controls; however, these are generally what is referred to as ...
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