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The ornamental design for an “adjustment device for helmet strap,” as shown and described.
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FIG. 1 is a perspective view of an “adjustment device for helmet strap” showing my new design;
FIG. 2 is a front view thereof;
FIG. 3 is a rear view thereof;
FIG. 4 is a left side view thereof;
FIG. 5 is a right side view thereof;
FIG. 6 is a top view thereof; and,
FIG. 7 is a bottom view thereof.
It being understood that the broken lines are for exemplary illustrative purposes only and form no part of the claimed design.
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