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The ornamental design for a clipboard, as shown and described.
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FIG. 1 is a front perspective view of a clipboard showing one embodiment of my new design;
FIG. 2 is a top plan view of the clipboard of FIG. 1;
FIG. 3 is a side elevation view of one side the clipboard of FIG. 1;
FIG. 4 is a rear elevation view the clipboard of FIG. 1;
FIG. 5 is a front elevation view the clipboard of FIG. 1;
FIG. 6 is a bottom plan view the clipboard of FIG. 1;
FIG. 7 is a front perspective view of a clipboard showing another embodiment of my new design;
FIG. 8 is a top plan view of the clipboard of FIG. 7;
FIG. 9 is a side elevation view of one side the clipboard of FIG. 7;
FIG. 10 is a rear elevation view the clipboard of FIG. 7;
FIG. 11 is a front elevation view the clipboard of FIG. 7; and,
FIG. 12 is a bottom plan view the clipboard of FIG. 7.
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