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The ornamental design for a portable heater, as shown. |
FIG. 1 is a perspective view taken in side elevation from one side of a portable heater embodying my design;
FIG. 2 is a perspective side elevation view taken from the opposite side of said portable heater;
FIG. 3 is a view of one side of the portable heater taken in side elevation;
FIG. 4 is a top view thereof;
FIG. 5 is a view, in side elevation, of the opposite side of said portable heater;
FIG. 6 is an elevation view of the rear end of said portable heater;
FIG. 7 is an elevation view of the front end of said portable heater; and
FIG. 8 is a bottom view thereof.
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