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The ornamental design for a mandrel, as shown and described.
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FIG. 1 is a perspective view of the mandrel of the present invention;
FIG. 2 is a first end view of the mandrel of the present invention;
FIG. 3 is a second end view of the mandrel of the present invention;
FIG. 4 is a right side view of the mandrel of the present invention; and
FIG. 5 is a left side view of the mandrel of the present invention.
FIG. 6 is a top view of the mandrel of the present invention; and,
FIG. 7 is a bottom view of the mandrel of the present invention.
The broken line showing is for illustrative purposes only and forms no part of the claimed design.
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