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The ornamental design for knife sharpener, as shown and described. |
FIG. 1 is a front perspective view of a knife sharpener embodying my new design;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a right side elevational view thereof;
FIG. 4 is a rear side elevational view thereof;
FIG. 5 is a left side elevational view thereof;
FIG. 6 is a bottom plan view thereof;
FIG. 7 is a top plan view thereof;
FIG. 8 is a front elevational view of a modified embodiment of FIGS. 1-7;
FIG. 9 is a right side elevational view of the embodiment of FIG. 8;
FIG. 10 is a rear side elevational view of the embodiment of FIG. 8;
FIG. 11 is a left side elevational view of the embodiment of FIG. 8;
FIG. 12 is a bottom plan view of the embodiment of FIG. 8;
FIG. 13 is a top plan view of the embodiment of FIG. 8;
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