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The ornamental design for a back support, as shown and described. |
FIG. 1 is a perspective view of a back support showing my new design;
FIG. 2 is a top plan view thereof;
FIG. 3 is a bottom view thereof;
FIG. 4 is a right side elevational view thereof with the left side elevational view being a mirror image thereof;
FIG. 5 is an end view taken along the line 5--5; and,
FIG. 6 is an end view taken along the line 6--6 of FIG. 4.
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