An article for use in aggressive environments is presented. The rotor is arranged to be spaced apart from the stator with an air gap therebetween. The protrusion includes a shank and an engaging portion. The musical tone generation control means allows for controlling a generation of a musical tone based on a result of a comparison by the comparison means such that the musical tone corresponds either to the vibration of the head section or to the vibration of the rim section. A source electrode of the thin-film transistor extends from a side of a data-signal line and surrounds the drain electrode. Users of mobile computing platforms are provided with geographically-related services that use the geographic database.