I claim the ornamental design for a dust reduction device for an automobile, as shown and described.
FIG. 1 is the front perspective view of a dust reduction device for an automobile showing my new design;
FIG. 2 is the front view thereof;
FIG. 3 is the rear view thereof;
FIG. 4 is the left-side view thereof;
FIG. 5 is the right-side view thereof;
FIG. 6 is the top view thereof;
FIG. 7 is the bottom view thereof;
FIG. 8 is the bottom perspective view thereof;
FIG. 9 is the view showing overall the present design in separated state;
FIG. 10 is view showing the using status of the present design mounted on the disc brake caliper; and,
FIG. 11 is view showing the present design separated from the disc brake caliper.
The broken line showing is for the purpose of illustrating portions of the article and environmental structure and forms no part of the claimed design. The unshaded surfaces shown between the solid lines and the broken lines form no part of the claim.