Bathtub

FIG. 1 is an upper rear left perspective view of a bathtub showing our new design;

FIG. 2 is an upper rear perspective view thereof;

FIG. 3 is an upper right perspective view thereof;

FIG. 4 is an upper front perspective view thereof;

FIG. 5 is a top view thereof;

FIG. 6 is a rear elevation view thereof;

FIG. 7 is a front elevation view thereof;

FIG. 8 is a left side elevation view thereof; and,

FIG. 9 is a right side elevation view thereof.

The portions of the bathtub shown in broken lines form no part of the claimed design.

The dashed-dotted line showings of FIGS. 1-9 illustrate boundaries between the claimed design and environmental features.