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The ornamental design for a protective helmet, as shown. |
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FIG. 1 is a left side view of the protective helmet showing our new design;
FIG. 2 is a right side view of the protective helmet;
FIG. 3 is a front view of the protective helmet;
FIG. 4 is a back view of the protective helmet;
FIG. 5 is a top view of the protective helmet; and
FIG. 6 is a bottom view of the protective helmet.
Piech, Corina, Schleicher, Wolfram
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