US D368818 S
FIG. 1 is a front perspective view of an adjustable backrest showing our new design;
FIG. 2 is a front elevational view;
FIG. 3 is a rear elevational view;
FIG. 4 is a top plan view;
FIG. 5 is a bottom plan view; and,
FIG. 6 is a left side elevational view thereof.