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The ornamental design for a portable support seat, as shown and described. |
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FIG. 1 is a frontal (or rear) elevational view of the novel portable support seat;
FIG. 2 is a left side elevational view thereof;
FIG. 3 is a right side elevational view thereof;
FIG. 4 is a top plan view thereof;
FIG. 5 is a bottom plan view thereof; and,
FIG. 6 is a perspective view of the novel seat thereof.
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