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  2. Electromagnetic door holder - Wikipedia

    en.wikipedia.org/wiki/Electromagnetic_door_holder

    A simple electromagnetic door holder consists of a strong electromagnet, usually attached to a wall or mounted in a floor pedestal enclosure, next to the door it controls. The mechanism may be mounted near the floor, at the upper corner of the open door, or at any convenient height along the latch edge (away from the hinged edge).

  3. Electromagnetic lock - Wikipedia

    en.wikipedia.org/wiki/Electromagnetic_lock

    Because the mating area of the electromagnet and armature is relatively large, the force created by the magnetic flux is strong enough to keep the door locked even under stress. Typical single door electromagnetic locks are offered in both 600 lbs. (2669 N) and 1200 lbs. (5338 N) dynamic holding force capacities. A "fail safe" magnetic lock ...

  4. Magnetic keyed lock - Wikipedia

    en.wikipedia.org/wiki/Magnetic_keyed_lock

    A magnetic keyed padlock A magnetic keyed padlock. A magnetic keyed lock or magnetic-coded lock is a locking mechanism whereby the key utilizes magnets as part of the locking and unlocking mechanism. Magnetic-coded locks encompass knob locks, cylinder locks, lever locks, and deadbolt locks as well as applications in other security devices.

  5. Door security - Wikipedia

    en.wikipedia.org/wiki/Door_security

    A metal doorframe with a strike plate built in: in other doors this would be a metal strikeplate in a wooden doorframe. The term door security or door security gate may refer to any of a range of measures used to strengthen doors against door breaching, ram-raiding and lock picking, and prevent crimes such as burglary and home invasions.

  6. Access control - Wikipedia

    en.wikipedia.org/wiki/Access_control

    A magnetic door switch for monitoring door position; Request-to-exit (RTE) devices for allowing egress. When a RTE button is pushed, or the motion detector detects motion at the door, the door alarm is temporarily ignored while the door is opened. Exiting a door without having to electrically unlock the door is called mechanical free egress.

  7. See Why Strong Magnets Have a Bizarre Reaction to Copper - AOL

    www.aol.com/lifestyle/see-why-strong-magnets...

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