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A Knox vault in an academic building A Knox KeySecure, attached inside the cab of a fire engine, holds a high-security key [broken anchor] to open KnoxBox key boxes in the area. A Knox Box is a small, wall-mounted safe that holds building keys for fire departments , emergency medical services , and sometimes police to retrieve in emergency ...
An arrow lock is metal and rectangular, measuring 2.005 in × 3.566 in × 0.620 in (50.9 mm × 90.6 mm × 15.7 mm) with a keyhole in the center. [2] When the user turns the key, a metal bar that normally protrudes from one side is moved through the lock to the other side.
Special keys provided to firefighters to access a Knox Box or other lockbox, located on some commercial buildings, containing additional keys required for entry or other safety features. Fire extinguisher See Extinguisher above. Fire bike or firefighting motorcycle A motorcycle that is equipped to fight fires or used as support. Commonly used ...
Knob-and-tube wiring (sometimes abbreviated K&T) is an early standardized method of electrical wiring in buildings, in common use in North America from about 1880 to the 1930s.
Aperture width of either 230–280 mm (> C4 width) or 325–400 mm (> C4 height) Aperture height of 30–35 mm; Mounting height of between 0.7 and 1.7 m for the aperture; When positioned externally, the post box should not allow more than 1% total capacity water ingress from natural precipitation or moisture causes.
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Door chains are fairly easy to install and use. Use of a door chain provides a little security when dealing with strangers. A properly installed door chain is resistant to tampering from the outside requiring use of physical force to open the door, which will leave obvious evidence.
The first known example of a tumbler lock was found in the ruins of the Palace of Khorsabad built by king Sargon II (721–705 BC.) in Iraq. [1] Basic principles of the pin tumbler lock may date as far back as 2000 BC in Egypt; the lock consisted of a wooden post affixed to the door and a horizontal bolt that slid into the post.