mating surfaces of the memory card and cover when the cover is in the positions shown by respective FIGS. 4A, 4B and 4C; FIG. 7 is a front plan view of the memory card shown in FIG. 4A, its cover being closed; FIG. 7A is an enlarged view of a portion of the card of FIG. 7 that is surrounded by a dashed line marked 7A; FIG. 8 is a bottom edge view of the memory card shown in FIG. 4C, its cover bei