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The ornamental design for a knife sharpener, as shown and described. |
FIG. 1 is a top plan view of a knife sharpener showing my new design;
FIG. 2 is a right side elevational view thereof, the left side being the same in appearance as the right side;
FIG. 3 is a rear elevational view thereof;
FIG. 4 is a front elevational view thereof;
FIG. 5 is a bottom plan view thereof;
FIG. 6 is a sectional view thereof taken along line 6--6 of FIG. 2; and
FIG. 7 is a right, top perspective view thereof.
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