Backrest for use in a bathtub
FIG. 1 is a top plan view of a backrest for use in a bathtub showing my new design; 
     FIG. 2 is a side view thereof; 
     FIG. 3 is a bottom view thereof; 
     FIG. 4 is an elevational view taken from one end thereof; 
     FIG. 5 is an elevational view taken from the end opposite that shown in FIG. 4; and 
     FIG. 6 is a perspective view thereof.