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The ornamental design for a letter opener, as shown and described. |
FIG. 1 is a reduced top, front, and left side perspective view of the design;
FIG. 2 is a top plan view thereof;
FIG. 3 is a front view thereof;
FIG. 4 is a left side view thereof;
FIG. 5 is a right side view thereof;
FIG. 6 is a rear view thereof;
FIG. 7 is a bottom plan view thereof;
FIG. 8 is a reduced top, front, and left side perspective view of a second embodiment of the design;
FIG. 9 is a front view, the rear being a mirror image thereof, and the top, sides, and bottom being the same in appearance as FIGS. 2, 4, 5, and 7; and,
FIG. 10 is a front view of a third embodiment of the design, the rear being a mirror image thereof, and the top, sides, and bottom being the same in appearance as FIGS. 2, 4, 5, and 7.
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