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The ornamental design for a knife sharpener, as shown and described. |
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FIG. 1 is a perspective view of a knife sharpener showing my new design;
FIG. 2 is a right side elevational view thereof;
FIG. 3 is a left side elevational view thereof;
FIG. 4 is a bottom plan view thereof;
FIG. 5 is a top plan view thereof;
FIG. 6 is a rear elevational view thereof; and,
FIG. 7 is a front elevational view thereof.
Taylor, Alvin E., Button, Frank R.
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| Executed on | Assignor | Assignee | Conveyance | Frame | Reel | Doc |
| May 02 1989 | BUTTON, FRANK R | TRI-V CORPORATION, THE | ASSIGNMENT OF ASSIGNORS INTEREST | 005079 | /0436 | |
| May 02 1989 | TAYLOR, ALVIN E | TRI-V CORPORATION, THE | ASSIGNMENT OF ASSIGNORS INTEREST | 005079 | /0436 | |
| May 30 1989 | The Tri-V Corporation | (assignment on the face of the patent) | / |
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