The device according to the invention comprises a sensor formed by a plurality of capacitive or resistive electrodes. The user searches the symbol to be selected by displacing his finger on the sensor while looking at a control display unit. Any position of the finger on the sensor causes the display...http://www.google.co.uk/patents/US4242676?utm_source=gb-gplus-sharePatent US4242676 - Interactive device for data input into an instrument of small dimensions
