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			 The ornamental design for a "clipboard case", as shown and described.        | 
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FIG. 1 is a perspective view;
FIG. 2 is a top view;
FIG. 3 is a bottom view;
FIG. 4 is a side view;
FIG. 5 is a side view similar to FIG. 4 except rotated 180 degrees;
FIG. 6 is an end view; and,
FIG. 7 is an end view similar to FIG. 6 except rotated 180 degrees.
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