A steerable wheelbarrow is described which includes two handles coupled to a tray and two legs coupled to the handles. A slider is formed on a substrate. To form the through hole, the rear face of the substrate is ground or etched away to remove material up to and including the dead-end wall of the blind hole. The reading circuit generates one of a plurality of threshold detection voltages to detect one of a plurality of programmed threshold voltages representative of multiple data bits, generates a drain voltage level to activate the charge-trapping nonvolatile memory cell.