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The ornamental design for a rotating ball caster, as shown and described. |
FIG. 1 is a top plan view of the rotating ball caster illustrating one embodiment of the present invention;
FIG. 2 is a front elevational view of the rotating ball caster of FIG. 1, the left side, rear, and right side views appearing the same as the front view;
FIG. 3 is a bottom plan view of the rotating ball caster of FIG. 1;
FIG. 4 is a top plan view of a second embodiment of the rotating ball caster of the present invention;
FIG. 5 is a front elevational view of the rotating ball caster of FIG. 4, the left side, rear, and right side views appearing the same as the front view; and,
FIG. 6 is a bottom plan view of the rotating ball caster of FIG. 4.
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