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The ornamental design for a portable support platform, as shown and described. |
FIG. 1 is a perspective view of a portable support platform showing my new design, a portion of a polish rod of the well and the pumper being shown in phantom for illustrative purposes only and forms no part of the claimed design;
FIG. 2 is an elevational view of one side thereof;
FIG. 3 is an elevational view of an opposite side thereof;
FIG. 4 is a top plan view thereof;
FIG. 5 is a bottom plan view thereof;
FIG. 6 is an elevational view of one end thereof; and
FIG. 7 is an elevational view of an opposite end thereof.
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