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The height of a rack can vary from a few inches, such as in a broadcast console, to a floor-mounted rack whose interior is 45 rack units (200.2 centimetres or 78.82 inches) high. 42U is a common configuration. Many wall-mounted enclosures for industrial equipment use 19-inch racks.
Rack with sample component sizes including an A/V half-rack unit. A rack unit (abbreviated U or RU) is a unit of measure defined as 1 + 3 ⁄ 4 inches (44.45 mm). [1] [2] It is most frequently used as a measurement of the overall height of 19-inch and 23-inch rack frames, as well as the height of equipment that mounts in these frames, whereby the height of the frame or equipment is expressed ...
A classically detailed bracket at the chapel of Greenwich Hospital, London Bracket for a shelf or hanging items. A bracket is a structural or decorative architectural element that projects from a wall, usually to carry weight and sometimes to "strengthen an angle". [1] [2] It can be made of wood, stone, plaster, metal, or other media.
The Baird "Televisor" (sold in 1930–1933 in the UK) is considered the first mass-produced television, selling about a thousand units. [8] Karl Ferdinand Braun was the first to conceive the use of a CRT as a display device in 1897. [9] The "Braun tube" became the foundation of 20th century TV. [10]
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