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The ornamental design for an invalid cushion, as shown. |
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FIG. 1 is a top perspective view of an invalid cushion showing my new design;
FIG. 2 is a top plan view thereof;
FIG. 3 is a bottom plan view thereof;
FIG. 4 is a front elevation view thereof;
FIG. 5 is a rear elevation view thereof;
FIG. 6 is a right side elevation view thereof; and
FIG. 7 is a left side elevation view thereof.
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