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The ornamental design for a jack stand, as shown and described.
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FIG. 1 is a front elevational exploded view of the jack stand of the present invention, the rear view being a mirror image thereof;
FIG. 2 is a left side elevational exploded view of the jack stand of FIG. 1, the right view being a mirror image thereof;
FIG. 3 is a top plan exploded view of the jack stand of FIG. 1;
FIG. 4 is a bottom plan exploded view of the jack stand of FIG. 1; and,
FIG. 5 is a top, front, right side perspective view of the jack stand of FIG. 1 in an assembled position.
The inside of the hollow, square pieces visible in FIGS. 3 and 4 are plain and unornamental and form no part of the claimed design.
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