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The ornamental design for a portable greenhouse, as shown and described. |
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FIG. 1 is a front perspective view of a portable greenhouse showing our new design;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a side elevational view thereof; and
FIG. 4 is a top plan view thereof.
The bottom of the portable greenhouse is flat and plain.
Blanchard, Steven D., Strenger, John R.
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