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The ornamental design for a door knob cover, as shown and described. |
FIG. 1 is a perspective view of the door knob cover according to the present invention;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a rear elevational view thereof;
FIG. 4 is an elevational view of one side of the door knob cover thereof;
FIG. 5 is an elevational view of the opposite side thereof;
FIG. 6 is a top plan view of the door knob cover; and,
FIG. 7 is a bottom plan view thereof.
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