Combined seat and backrest for a chair

FIG. 1 is a front elevational view of a combined seat and backrest embodying the design;

FIG. 2 is a side elevational view of the combined seat and backrest of FIG. 1;

FIG. 3 is a top view of the combined seat and backrest of FIG. 1;

FIG. 4 is a rear elevational view of the combined seat and backrest of FIG. 1;

FIG. 5 is a bottom view of the combined seat and backrest of FIG. 1;

FIG. 6 is a side elevational view of a modified form of a combined _seat and backrest embodying the design;

FIG. 7 is a front elevational view of the combined seat and backrest of FIG. 6;

FIG. 8 is a rear elevational view of the combined seat and backrest of FIG. 6;

FIG. 9 is a top view of the combined seat and backrest of FIG. 6;

FIG. 10 is a bottom view of the combined seat and backrest of FIG. 6;

FIG. 11 is a side elevational view of another modified form of a combined seat and backrest embodying the design;

FIG. 12 is a front elevational view of the combined seat and backrest of FIG. 11;

FIG. 13 is a rear elevational view of the combined seat and backrest of FIG. 11;

FIG. 14 is a top view of the combined seat and backrest of FIG. 11;

FIG. 15 is a bottom view of the combined seat and backrest of FIG. 11;

FIG. 16 is a side elevational view of still another modified form of a combined seat and backrest embodying the design;

FIG. 17 is a front elevational view of the combined seat and backrest of FIG. 16;

FIG. 18 is a rear elevational view of the combined seat and backrest of FIG. 16;

FIG. 19 is a top view of the combined seat and backrest of FIG. 16; and

FIG. 20 is a bottom view of the seating unit of FIG. 16.