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The ornamental design for a double writing instrument, as shown and described. |
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FIG. 1 is a perspective view of the design;
FIG. 2 is a left side elevational view;
FIG. 3 is a right side elevational view;
FIG. 4 is both a rear and front elevational view as such views are identical;
FIG. 5 is a top plan view; and,
FIG. 6 is a bottom view thereof.
Manabe, Toshio, Fukami, Masaaki
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