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The ornamental design for a portable back rest, as shown and described. |
FIG. 1 is a perspective view of the portable back rest embodying the design of the present invention;
FIG. 2 is a front elevational view thereof, the rear being a mirror image of the front shown in FIG. 2;
FIG. 3 is an end elevational view thereof;
FIG. 4 is an end elevational view thereof;
FIG. 5 is a top plan view thereof; and,
FIG. 6 is a bottom view thereof.
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