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The ornamental design for a writing instrument, as shown and described. |
FIG. 1 is a front perspective view of a writing instrument showing our new design;
FIG. 2 is a left side elevational view;
FIG. 3 is a front elevational view;
FIG. 4 is a right side elevational view;
FIG. 5 is a top plan view; and,
FIG. 6 is a bottom plan view thereof.
Covington, Jay C., Matthews, Gary N.
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