FIG. 1 is a perspective view of a back embodying the present invention.

FIG. 2 is a front view of the back shown in FIG. 1.

FIG. 3 is a left side view of the back arrangement shown in FIG. 1, the right side being a mirror image thereof.

FIGS. 4–6 are rear, top, and bottom views, respectively, of the back arrangement shown in FIG. 1.

FIG. 7 is a perspective view of a second back embodying the present invention.

FIG. 8 is a front view of the back shown in FIG. 7.

FIG. 9 is a left side view of the back arrangement shown in FIG. 7, the right side being a mirror image thereof; and,

FIGS. 10–12 are rear, top, and bottom views, respectively, of the back shown in FIG. 7.

The dashed lines in FIGS. 1–12 are to show the environment, but do not form a part of the claimed invention.