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A rare surviving Apple computer that was the first to use a mouse has emerged for sale for £30,000.
The Apple Lisa 1 machine was revolutionary as it was the first PC to allow users to interact with the device using the hand tool.
It also used graphical icons instead of text and was the first time overlapping windows, pull-down menus and the drag and drop function appeared.
The one now for sale in Germany belongs to a German university professor who was given it as a retirement present.