I claim the ornamental design for a hair clipper, as shown and described.
FIG. 1 is a perspective view of a hair clipper showing my new design;
FIG. 2 is a front view of the hair clipper as shown in FIG. 1;
FIG. 3 is a back view of the hair clipper as shown in FIG. 1;
FIG. 4 is a left-side view of the hair clipper as shown in FIG. 1;
FIG. 5 is a right-side view of the hair clipper as shown in FIG. 1;
FIG. 6 is a top view of the hair clipper as shown in FIG. 1; and,
FIG. 7 is a bottom view of the hair clipper as shown in FIG. 1.
The evenly spaced broken lines illustrate portions of the hair clipper and the dash-dot-dash broken lines illustrate the bounds of the claim. None of the broken line disclosure forms part of the claimed design.