Hair straightening appliance

[0001]FIG. 1 is a top, side perspective view of an ornamental design for a hair straightening appliance according to the present invention;

[0002]FIG. 2 is a right side elevational view of the hair straightening appliance of FIG. 1;

[0003]FIG. 3 is a left side elevational view of the hair straightening appliance of FIG. 1;

[0004]FIG. 4 is a top plan view of the hair straightening appliance of FIG. 1;

[0005]FIG. 5 is a bottom plan view of the hair straightening appliance of FIG. 1;

[0006]FIG. 6 is a rear elevational view of the hair straightening appliance of FIG. 1; and,

[0007]FIG. 7 is a front elevational view of the hair straightening appliance of FIG. 1.

[0008]The broken lines in the figures are for the purpose of illustrating portions of the hair straightening appliance, which form no part of the claimed design.