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A "draw bolt" style closure adds a handle for sliding its bolt - the source of the term "bolting a door". A variant with a slot in the handle for dropping it over a hasp to secure it with a lock is known as an aldrop. Most modern draw bolts are made of metal, and may be used to secure a door from the outside or the in.
An improved "shear" electromagnetic lock was patented on May 2, 1989, by Arthur, Richard and David Geringer of Security Door Controls, an access control hardware manufacturing firm. The device outlined in their designs was the same in principle as the modern magnetic lock consisting of an electromagnet and an armature plate.
Digital Addressable Lighting Interface (DALI) is a trademark for network-based products that control lighting. The underlying technology was established by a consortium of lighting equipment manufacturers as a successor for 1-10 V/ 0–10 V lighting control systems, and as an open standard alternative to several proprietary protocols.
I absolutely love tomatoes, any kind, any size. Being from the South, that includes fried green tomatoes. I created a special summer sandwich to show them off.
Security screen doors add a second set of hinges or locks to defeat before access to a structure can be granted. If the intention is to keep thieves out, or keep disturbed individuals in, this is a better solution. Security screen doors also make it possible to open the main door, and communicate with those outside. Some even have mail slots.
While facing the door from the outside or less secure side, if the hinge is on the right side of the door, the door is "right handed"; or if the hinge is on the left, it is "left handed". If the door swings toward you, it is "reverse swing"; or if the door swings away from you, it is "normal swing". In other words: In the United States:
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The concrete markers also caused more damage than metal posts when struck by cars and presented maintenance problems: "Every two to three years we had to repaint them and re-stencil the street ...
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