Law Offices of Brian S. Steinberger
Four-wheel hand truck with elevator
 A four wheel hand truck with elevator in which one pair of wheels are stationary as in a typical hand truck and the other pair of wheels are slidable upon vertical shafts and powered by a cable and winch assembly. A person can place the slidable pair of wheels on the outward edge of a pick-up truck bed and lower the entire hand truck and associated load to the ground or vice versa. 
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Jimmy
Liu