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I claim an ornamental design of a three-ski device, as shown and described.
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FIG. 1 illustrates a front left plan view of an ornamental design of the three-ski device in accordance with the present invention;
FIG. 2 illustrates a rear left plan view of the invention of FIG. 1;
FIG. 3 illustrates a bottom elevational view of the invention of FIG. 1;
FIG. 4 illustrates a top elevational view of the invention of FIG. 1; and,
FIG. 5 illustrates a side elevational view of the invention of FIG. 1.
The broken line showing of a seat is for illustrative purposes only and forms no part of the claimed design.
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