The ornamental design for a portion of a multi-pole plug, as shown and described.
FIG. 1 is a front view of the portion of the multi-pole plug of the present invention.
FIG. 2 is a rear view.
FIG. 3. is a side view of the right side of the portion of the multi-pole plug of the present invention.
FIG. 4 is a side view of the left side of the portion of the multi-pole plug of the present invention.
FIG. 5 is a top view of the portion of the multi-pole plug of the present invention.
FIG. 6 is a bottom view of the portion of the multi-pole plug of the present invention; and,
FIG. 7 is right perspective view of the portion of the multi-pole plug of the present invention.
The portions of the plug body shown in broken lines are included in the drawings to show unclaimed subject matter only and form no part of the claimed design.