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The ornamental design for the portable spray arm, as shown and described. |
FIG. 1 is a perspective view of a portable spray arm illustrating my new design;
FIG. 2 is a top plan view thereof;
FIG. 3 is a bottom plan view thereof;
FIG. 4 is front elevational view thereof;
FIG. 5 is a right side elevational view thereof, the left side being a mirror image of the right side shown; and
FIG. 6 is a rear elevational view thereof.
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