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The ornamental design for a grapefruit knife, as shown. |
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FIG. 1 is a top plan view of a grapefruit knife showing my new design;
FIG. 2 is a side elevational view thereof;
FIG. 3 is an opposite side elevational view thereof;
FIG. 4 is an enlarged sectional view taken along line 4--4 in FIG. 2;
FIG. 5 is an enlarged sectional view taken along line 5--5 in FIG. 2; and
FIG. 6 is an enlarged sectional view taken along line 6--6 in FIG. 2.
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