The ornamental design for dry flotation bed, as shown and described.
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1.-3. Dry flotation bed
1.1 : Perspective
1.2 : Front
1.3 : Right
2.0 : Perspective
3.0 : Perspective
In the first design the top view is omitted since it is visible in its entirety from the perspective view 1.1; moreover, in the first design, the back view is omitted since it is the mirror image of the front view 1.2, and the left view is omitted since it is the mirror image of the right view 1.3.