Northrop Grumman's helps build Rob-Mule Wheel-Leg for Army

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If successful, the wheel/leg hybrid could have all sorts of uses for both powered and unpowered vehicles. The robotic mule and its relations will be the first beneficiaries, but it could give to a new generation of all-terrain vehicles. Eventually everything from electric wheelchairs to baby buggies may be able to negotiate all sorts of obstacles that are impossible today with the aid of the new hybrid.[/QUOTE]

http://www.defensetech.org/archives/001876.html