An improved user interface for use in interactive electronic devices. The user interface eliminates the complexity and ambiguity problems encountered in conventional interfaces through the incorporation of a physical overlay designed for use in cooperation with a contiguous touch screen or a plurality...http://www.google.fr/patents/US5572573?utm_source=gb-gplus-shareBrevet US5572573 - Removable user interface for use with interactive electronic devices
Removable user interface for use with interactive electronic devices
