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The ornamental design for the invalid seat cushion, as shown and described. |
FIG. 1 is a front, top and right side perspective view of an invalid seat cushion showing my new design;
FIG. 2 is a top plan view, the bottom being substantially identical;
FIG. 3 is a view like FIG. 1 with the insert removed;
FIG. 4 is a front elevational view with the insert in place;
FIG. 5 is a view like FIG. 3 of a modified form of an invalid seat cushion showing my new design wherein the insert is C-shaped; and
FIG. 6 is a top plan view thereof with the insert in place, the bottom being substantially identical.
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