Abstract: Material is removed from a body of material, e.g. to create a bore hole, by plasma channel drilling. High voltage, high energy, rapid rise time electrical pulses are delivered many times per second to an electrode assembly in contact with the material body to generate therein elongate plasma channels which expand rapidly following electrical breakdown of the material causing the material to fracture and fragment.

Abstract: A cap for a pick-up truck load bed, the bed having a floor and a pair of side walls extending longitudinally on each side of the long axis of the truck, said cap comprising a roof and a pair of side walls depending therefrom and extending longitudinally substantially coextensive therewith, said roof being split centrally longitudinally to provide substantially equal split halves, means for releasably securing the split sections of said roof along the central longitudinal split line and hinge means for pivoting the cap split halves to the side walls of the truck load bed.