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2. Electromagnetic lock - Wikipedia

   en.wikipedia.org/wiki/Electromagnetic_lock

   Given the relative permeability of a material can vary from around 250 for cobalt to around 5000 for soft iron and 7000 for silicon–iron, the choice of magnetic core can therefore have an important impact upon the strength of a magnetic lock. Also relevant is the choice of current, number of loops and effective length of the electromagnet.

3. Electromagnetic door holder - Wikipedia

   en.wikipedia.org/wiki/Electromagnetic_door_holder

   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.

4. Keycard lock - Wikipedia

   en.wikipedia.org/wiki/Keycard_lock

   A keycard lock is a lock operated by a keycard, a flat, rectangular plastic card. The card typically, but not always, has identical dimensions to that of a credit card , that is ID-1 format . The card stores a physical or digital pattern that the door mechanism accepts before disengaging the lock.

5. Pole piece - Wikipedia

   en.wikipedia.org/wiki/Pole_piece

   A pole piece is a structure composed of material of high magnetic permeability that serves to direct the magnetic field produced by a magnet. A pole piece attaches to and in a sense extends a pole of the magnet, hence the name. Pole pieces are used with both permanent magnets and electromagnets.

6. Honeywell - Wikipedia

   en.wikipedia.org/wiki/Honeywell

   Honeywell, Groupe Bull, and Control Data Corporation formed a joint venture in Magnetic Peripherals Inc. which became a major player in the hard disk drive market. [ 12 ] : 124 Honeywell was the worldwide leader in 14-inch disk drive technology in the OEM marketplace in the 1970s and early 1980s, especially with its SMD (Storage Module Drive ...

7. 'Massive' Russian air attack follows record-breaking ...

   www.aol.com/massive-russian-air-attack-follows...

   A source in the Security Service of Ukraine told ABC News that Ukrainian forces are continuing to "work on enemy military facilities and enterprises that work for the Russian military-industrial ...