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The ornamental design for a back rest cushion, as shown and described. |
FIG. 1 is a front and right side perspective view of a back rest cushion showing our new design;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a right side elevational view thereof, the left side being a mirror image of that shown;
FIG. 4 is a rear elevational view thereof;
FIG. 5 is a top plan view thereof; and
FIG. 6 is a bottom plan view thereof.
The cross-hatching employed throughout the views is understood to represent a conventional fabric material.
Clark, Robert F., Smythe, Hugh A.
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