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The ornamental design for an electric heater, as shown. |
FIG. 1 is a perspective view of an ornamental design for an electric heater according to the present invention;
FIG. 2 is a top plan view thereof;
FIG. 3 is a bottom plan view thereof;
FIG. 4 is a front view thereof;
FIG. 5 is a rear view thereof;
FIG. 6 is a left side view thereof; and,
FIG. 7 is a right side view thereof.
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