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The ornamental design for a portable mixer, substantially as shown. |
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FIG. 1 is a perspective view of a portable mixer showing my new design;
FIG. 2 is a front elevation view;
FIG. 3 is a side elevation view;
FIG. 4 is a rear elevation view;
FIG. 5 is a top plan view; and,
FIG. 6 is a bottom plan view.
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