Input Device

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An input device is any hardware system that delivers information with no input devices, towards the computer, a computer might just be considered a screen system and never let customers to connect to it, similar to a Television.

The image is just a typical example of an input device and a Logitech trackball mouse.

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Alexander Graham Bell (March 3, 1847 – August 2, 1922) was a Scottish-born scientist, inventor, engineer, and innovator who is credited with patenting the first practical telephone.