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The ornamental design for an inflatable lumbar pillow, as shown and described.
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FIG. 1 is a perspective view of the inflatable lumbar pillow, taken from the front and left;
FIG. 2 is a top plan view of the inflatable lumbar pillow of FIG. 1;
FIG. 3 is a front elevational view of the inflatable lumbar pillow of FIG. 1;
FIG. 4 is a rear view of the inflatable lumbar pillow of FIG. 1;
FIG. 5 is a bottom plan view of the inflatable lumbar pillow of FIG. 1; and,
FIG. 6 is a right side view of the inflatable lumbar pillow of FIG. 1, the opposite side being a mirror image thereof.
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