A self propelled transportable lift truck having a frame formed by two spaced parallel longitudinal front members and a rear transverse member, at least two front wheels and at least one steerable rear wheel, such that the lifting mechanism thereby extends from a most retracted position between the longitudinal members of the frame. The offset voltage signal generated by each magnetic field sensor is used to correct variations in the output signal due to temperature variations and aging. Additionally or alternatively, the reduction in T-cell mitogenicity is achieved by removing unmodified subunits chemically modified mixtures. A plurality of wirebonds run between individual pin contacts and individual wirebond pads.