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The ornamental design for a rolling stair, as shown and described. |
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FIG. 1 is a front view of the rolling stair of the present invention.
FIG. 2 is a rear view thereof.
FIG. 3 is a top view thereof.
FIG. 4 is a bottom view thereof.
FIG. 5 is a right side view thereof. The left side view is a mirror image thereof; and,
FIG. 6 is a perspective view thereof.
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