. . "Moreover, end surfaces of the first keyboard unit 3 and the second keyboard unit 4 are covered by the end plate 13 as in the first embodiment described previously. [0067] FIGS. 10 to 19 are diagrams showing a third embodiment of the present invention, in which, FIG. 10 is a plan view illustrating a membrane switch as considered previously before being integrated; FIG. 11 is a plan view of the memb" . .