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The ornamental design for a protective helmet, as shown. |
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FIG. 1 is a front elevational view of a protective helmet showing our new design;
FIG. 2 is a side perspective view thereof;
FIG. 3 is a left side elevational view thereof;
FIG. 4 is a top plan view thereof; and,
FIG. 5 is a rear elevational view thereof.
Comstock, Scott P., Comstock, Kurt J.
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