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The ornamental design for a coolant filter, as shown and described. |
FIG. 1 is a top perspective view of a coolant filter showing my new design;
FIG. 2 is a front elevational view thereof, the rear being identical in appearance;
FIG. 3 is a side elevational view thereof, the opposite side being identical in appearance;
FIG. 4 is a top plan view thereof;
FIG. 5 is a bottom plan view thereof;
FIG. 6 is a front elevational view of a second embodiment thereof, the only difference residing in its height; and
FIG. 7 is a top plan view of a third embodiment thereof, the only difference residing in its width.
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