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The ornamental design for a keyboard shelf, as shown and described. |
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FIG. 1 shows a bottom left rear perspective view of a keyboard shelf according to the principles of the present invention;
FIG. 2 shows a top left rear perspective view of the keyboard shelf shown in FIG. 1;
FIG. 3 shows a bottom plan view of the keyboard shelf shown in FIG. 1;
FIG. 4 shows a top plan view of the keyboard shelf shown in FIG. 1;
FIG. 5 shows a right side elevational view of the keyboard shelf shown in FIG. 1, a left side elevational view not being shown as it is substantially a mirror image of the right side elevational view;
FIG. 6 shows a front elevational view of the keyboard shelf shown in FIG. 1; and,
FIG. 7 shows a rear elevational view of the keyboard shelf shown in FIG. 1.
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