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The ornamental design for a portable ball hitch assembly, as shown and described. |
FIG. 1 is a perspective view of a portable ball hitch assembly according to the present invention;
FIG. 2 is a reduced top plan view thereof;
FIG. 3 is a reduced right side elevational view thereof;
FIG. 4 is a reduced front elevational view thereof;
FIG. 5 is a reduced left side elevational view thereof;
FIG. 6 is a reduced back elevational view thereof; and,
FIG. 7 is a reduced bottom plan view thereof.
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