The ornamental design for a shelf, as shown and described.
This patent contains at least one drawing/photograph executed in color. Copies of this patent with colored drawing(s)/photograph(s) will be provided by the Office upon request and payment of the necessary fee.
FIG. 1 is a top perspective view of a shelf shown in a collapsed configuration.
FIG. 2 is a front elevational view of the invention shown in FIG. 1.
FIG. 3 is a rear elevational view of the invention shown in FIG. 1.
FIG. 4 is a top plan view of the invention shown in FIG. 1.
FIG. 5 is a bottom plan view of the invention shown in FIG. 1.
FIG. 6 is a hit side elevational view of the invention shown in FIG. 1.
FIG. 7 is a right side elevational view of the invention shown in FIG. 1.
FIG. 8 is a top perspective view of a shelf shown in an expanded configuration.
FIG. 9 is a front elevational view of the invention shown in FIG. 8, the rear elevational view being the mirror image thereof; and,
FIG. 10 is a top plan view of the invention shown in. FIG. 8, the bottom plan view being the mirror image thereof.