FIG. 1 is a front view of a tractor, showing our new design;
FIG. 2 is a rear view thereof;
FIG. 3 is a left side view thereof;
FIG. 4 is a right side view thereof;
FIG. 5 is a top view thereof;
FIG. 6 is an upper left rear perspective view thereof;
FIG. 7 is another front view thereof;
FIG. 8 is another rear view thereof;
FIG. 9 is another left side view thereof;
FIG. 10 is another right side view thereof; and,
FIG. 11 is another top view thereof.
The portions of the tractor illustrated in gray in FIGS. 7-11 are transparent surfaces.
A bottom view is omitted because it is plain and unornamental and forms no part of the subject matter of the claimed design.