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The ornamental design for a electric fan, as shown. |
FIG. 1 is a perspective view of a electric fan showing my new design;
FIG. 2 is a front elevation thereof;
FIG. 3 is a top plan view thereof;
FIG. 4 is a bottom plan view thereof;
FIG. 5 is a right side elevation thereof;
FIG. 6 is a left side elevation thereof; and
FIG. 7 is a rear elevation thereof.
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