A device for selectively manipulating movement of a cursor on a computer display, as with the user's foot. The device comprising a housing, an elongated control stick member protruding through an opening defined in the top wall of the housing, and sensors for detecting movements of the bottom...http://www.google.com/patents/US5751274?utm_source=gb-gplus-sharePatent US5751274 - Foot-operable cursor control device
