A prepreg assembly comprising resin and fibers and comprising an uppermost curable resin surface layer such that when the assembly is cured, the uppermost surface layer has a sandability of at least 0. A display section shows the image data. A base station generates an authentication key for authenticating a user of a subscriber station. In addition, this technology introduces metal electrodes, which greatly reduces the series resistance in electrode interconnects, thus, minimizing Q-loading effects while increasing the power handling ability of micromechanical resonators. The conductive elastic member urges a conductive wire against an inner face of the through hole so as to fix the conductive wire.