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  2. 19-inch rack - Wikipedia

    en.wikipedia.org/wiki/19-inch_rack

    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.

  3. Floating shelf - Wikipedia

    en.wikipedia.org/wiki/Floating_shelf

    A floating shelf can be supported on hidden rods or bars that have been attached to studs. A thick floating shelf may be made of a hollow-core shelf glued to a cleat. [7] A floating shelf may have two or more channels open from the back towards, but without reaching, the front, into which slide fasteners attached to the wall, typically held in place by screws inserted through the bottom of the ...

  4. Shelf (storage) - Wikipedia

    en.wikipedia.org/wiki/Shelf_(storage)

    A simple wooden wall shelf A wooden shelf with a great number of different hair colours in a hairdresser shop in Germany Floating Shelf & Floating Shelf Bracket installation Diagram. Courtesy of Shelfology® A shelf (pl.: shelves) [1] is a flat, horizontal plane used for items that are displayed or stored in a home, business, store, or

  5. Electronic shelf label - Wikipedia

    en.wikipedia.org/wiki/Electronic_shelf_label

    A shelf label with electronic paper display ESL tag modules use electronic paper (e-paper) or liquid-crystal displays (LCDs) to show the current product price to the customer. E-paper is widely used on ESLs as it provides a crisp display and supports full graphic images (typically only black and white) while only needing power during updates ...

  6. Power supply - Wikipedia

    en.wikipedia.org/wiki/Power_supply

    An external power supply, AC adapter or power brick, is a power supply located in the load's AC power cord that plugs into a wall outlet; a wall wart is an external supply integrated with the outlet plug itself. These are popular in consumer electronics because of their safety; the hazardous 120 or 240 volt main current is transformed down to a ...

  7. Surface-mount technology - Wikipedia

    en.wikipedia.org/wiki/Surface-mount_technology

    Surface-mount technology (SMT), originally called planar mounting, [1] is a method in which the electrical components are mounted directly onto the surface of a printed circuit board (PCB). [2] An electrical component mounted in this manner is referred to as a surface-mount device ( SMD ).