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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.
A door knocker is an item of door furniture that allows people outside a house or other dwelling or building to alert those inside to their presence. A door knocker has a part fixed to the door, and a part (usually metal) which is attached to the door by a hinge, and may be lifted and used to strike a plate fitted to the door, or the door itself, making a noise.
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.
Here's what Home Depot reported, compared to Wall Street estimates, according to Bloomberg consensus: Revenue: $36.42 billion versus $36.66 billion Adjusted earnings per share: $3.63 versus $3.60
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.
The knocker-up used a baton or short, heavy stick to knock on the clients' doors or a long and light stick, [5] often made of bamboo, to reach windows on higher floors. One famous photograph shot in 1931 by John Topham shows a knocker-up in East London using a pea-shooter. [6] In return for the task, the knocker-up would be paid a few pence a ...
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