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The ornamental design for electric fan, as shown and described.
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FIG. 1 is a front view thereof;
FIG. 2 is a left side view thereof;
FIG. 3 is a rear view thereof;
FIG. 4 is a perspective view thereof;
FIG. 5 is a top view thereof; and,
FIG. 6 is a right side view of an electric fan.
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