Claims (1)
Claim 1 (Independent)
The ornamental design for chair back, as shown and described.
Full Description
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FIG. 1 is a rear view of the chair back shown in use;
FIG. 2 is a perspective view;
FIG. 3 is a front view;
FIG. 4 is a back view;
FIG. 5 is a left side view;
FIG. 6 is a top plan view; and,
FIG. 7 is a bottom plan view.
The broken lines shown are included for illustrative purposes only form no part of the claimed design.