A data input device for use with a virtual reality system comprises an upper case, a lower case rotatably supporting the upper case, five push-buttons, and a potentiometer. The push-buttons correspond to the fingers of a virtual hand displayed on a screen of the virtual reality system, respectively,...http://www.google.co.uk/patents/US5905487?utm_source=gb-gplus-sharePatent US5905487 - Data input device and method for use with a virtual reality system
