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The ornamental design for the instructional windsurfing gauge, as shown and described. |
FIG. 1 is a front elevational view of an instructional windsurfing gauge showing my new design, the broken lines shown are for illustrative purposes only and form no part of the claimed design;
FIG. 2 is a rear elevationasl view thereof;
FIG. 3 is an enlarged left side elevational view thereof;
FIG. 4 is an enlarged right side elevational view thereof;
FIG. 5 is an enlarged top plan view thereof; and,
FIG. 6 is an enlarged bottom plan view thereof.
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