A stringed instrument, for example an electric guitar, is arranged to produce a tremolo effect by providing the tailpiece with a number of saddles corresponding to the number of strings, each saddle having a slot for anchoring its string. The instrument housing case includes: a main body case, which has a bottomed cylindrical shape, and includes an opened upper end surface and opened upper portions of parts of side surfaces; and a cover body. The source of antimony oxide used for the first catalyst is preferably particulate antimony trioxide having a mean particle size of from 0. A first exposure intensity is assigned to a first group of die on the surface of the wafer. The property can be a result of a physical property of the extended pattern in a second direction perpendicular to the first direction. In this arrangement, the local-oscillator input is coupled to the output of the phase-locked loop.