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The ornamental design for a safety helmet, shown and described. |
FIG. 1 is a front side perspective view of a safety helmet showing our new design;
FIG. 2 is a rear side perspective view thereof;
FIG. 3 is a front elevational view thereof;
FIG. 4 is a rear elevational view thereof;
FIG. 5 is a left side elevational view thereof;
FIG. 6 is a right side elevational view thereof;
FIG. 7 is a top view thereof; and,
FIG. 8 is a bottom view thereof.
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