The ornamental design for a part of a chair, as shown and described.
The patent or application file contains at least one drawing executed in color. Copies of this patent or patent application publication with color drawing(s) will be provided by the Office upon request and payment of the necessary fee.
1.1 is a perspective view of a part of a chair, showing my new design;
1.2 is a side view thereof;
1.3 is a side view thereof, from a side opposite that of 1.2;
1.4 is an end view thereof;
1.5 is an end view thereof, from an end opposite that of 1.4; and
1.6 is another side view thereof, from a different side than 1.2 and 1.3.
The broken lines are shown for the purpose of illustrating portions of the part of the chair that form no part of the claimed design. The components within the blue translucent overlays form no part of the claimed design.