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The ornamental design for an airfoil fin for surfboards, as shown and described. |
FIG. 1 is a perspective view of an airfoil fin for surfboards showing my new design, the broken lines are for illustrative purposes only and form no part of the claimed design;
FIG. 2 is a front elevation view thereof;
FIG. 3 is a left side elevation view thereof, the right side elevation view being a mirror image of that shown;
FIG. 4 is a rear elevation view thereof;
FIG. 5 is a top plan view thereof;
FIG. 6 is a bottom plan view thereof.
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