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The ornamental design for a sharpening stone, as shown and described. |
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FIG. 1 is an isometric view of the sharpening stone showing our new design;
FIG. 2 is a front view thereof, with the rear view being identical but reversed;
FIG. 3 is a right side view thereof, with the left side being identical;
FIG. 4 is a top view thereof; and,
FIG. 5 is a bottom view thereof.
McCoy, Duane K., Vermillion, Howard R.
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