A multidimensional mouse of computers includes a Z-axis key pivotally connected to the mouse by a pivot and defines two ends spaced from each other by the pivot. Two elastic loads respectively installed inside the mouse and a corresponding one of the two elastic loads is deformed in response to a manual...http://www.google.ca/patents/US5657051?utm_source=gb-gplus-sharePatent US5657051 - Multidimensional mouse for use with computers
