The ornamental design for a case for a tabletcomputing device, as shown and described.
FIG. 1 illustrates a left and front perspective view of a case for a tablet computing device to my new and ornamental design;
FIG. 2 illustrates an enlarged, fragmented top perspective view of the case for a tablet computing device, shown in FIG. 1 and shown in an unfolded condition of use;
FIG. 3 illustrates a left side perspective view of the case for a tablet computing device;
FIG. 4 illustrates a front perspective view of the case for a tablet computing device;
FIG. 5 illustrates a back perspective view of the case for a tablet computing device;
FIG. 6 illustrates an enlarged, fragmented bottom view of the case for a tablet computing device and shown in an unfolded condition of use; and,
FIG. 7 illustrates a bottom perspective view of the case for a tablet computing device shown in a partially folded condition of use.