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The ornamental design for a portable stadium cushion, as shown and described. |
FIG. 1 is a bottom, front, and left side perspective view of a portable stadium cushion showing my new design;
FIG. 2 is a top, rear, and left side perspective view thereof;
FIG. 3 is a reduced bottom plan view thereof;
FIG. 4 is a reduced right side elevational view thereof, the left side being a mirror image of that shown;
FIG. 5 is a bottom, front, and left side perspective view of a second embodiment thereof; and,
FIG. 6 is a top, rear, and left side perspective view of the embodiment of FIG. 5, the only difference residing in the configuration of the bottom.
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