The present invention is a compact personal digital assistant and cellular telephone with foldable dual-sided display. The method includes receiving at least one of a product category and a service category from an operator of a PCD. The oil pump is offset from an input shaft of the transmission and arranged so as to overlap the valve body andor the clutch mechanism when viewed from a direction perpendicular to the axial direction of the automatic transmission. In the etching, the lower contact layer plays a role of the etching stopper. The smoothing capacitor smoothes a voltage input to the voltage transforming part, the DCDC converter transforms voltage smoothed by the smoothing capacitor, and the backflow prevention device prevents backflow of charge from the smoothing capacitor while the signals are transmitted to a contactless power transmission circuit. The working and counter electrodes are configured so that a major portion of the counter electrode is located downstream on the flow path from the working electrode with the exception of a small sub-element of the counter electrode which is in electrical communication with the primary portion of the counter electrode and located upstream of the working electrode.