Claims (1)
Claim 1 (Independent)
The ornamental design for a mattress, as shown and described.
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FIG. 1 is an isometric view of a front, top, and left side of an ornamental design for a mattress;
FIG. 2 is an elevational view of the left side of the mattress of FIG. 1 , a right side being identical to the left side; and,
FIG. 3 is an elevational view of the mattress of FIG. 1 , a rear being identical to the front.