"FIG. 29B is a plan view showing the inner side surface of the upper second housing portion 102 b shown in FIG. 29A. FIG. 29C is a plan view showing an outer side surface of the upper second housing portion 102 b shown in FIG. 29A. [0229] Referring to FIGS. 29A, 29B and 29C, the conductor layer 102 bm made of an electrically conductive material such as magnesium or zinc and including a rectangular" . . . .