Knife sharpener

USD1116689SActive Publication Date: 2026-03-10WU XIAOMING

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[0001] FIG. 1 is a rear, right and bottom perspective view of a knife sharpener, showing my new design;

[0002] FIG. 2 is a front, right and top perspective view thereof;

[0003] FIG. 3 is a front view thereof;

[0004] FIG. 4 is a rear view thereof;

[0005] FIG. 5 is a left side view thereof;

[0006] FIG. 6 is a right side view thereof;

[0007] FIG. 7 is a top plan view thereof; and,

[0008] FIG. 8 is a bottom plan view thereof.

[0009] The broken lines shown in the drawings illustrate portions of the knife sharpener that form no part of the claimed design.

The ornamental design for a knife sharpener, as shown and described.