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The ornamental design for a mobile filter apparatus, as shown. |
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FIG. 1 is a left side view;
FIG. 2 is a right side view;
FIG. 3 is a front plan view;
FIG. 4 is a top view;
FIG. 5 is a back view; and,
FIG. 6 is a bottom view.
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| 214375, |
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