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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.
Prominent marketers of As seen on TV products include As Seen on TV, Inc., Time Life, Space Bag, K-tel, Ronco, and Thane. There are also retail brick and mortar and online stores that specifically sell As seen on TV products. [1] In 1996, "As seen on TV" then moved on to retail, according to A. J. Khubani, CEO of Telebrands, who designed the ...
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.
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The card stores a physical or digital pattern that the door mechanism accepts before disengaging the lock. There are several common types of keycards in use, including the mechanical holecard, barcode , magnetic stripe , Wiegand wire embedded cards, smart card (embedded with a read/write electronic microchip ), RFID , and NFC proximity cards.
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