US D336553 S
FIG. 1 is a top, front and side perspective view of a protective helmet showing my new design;
FIG. 2 is a side elevational view thereof, the opposite side being a mirror image;
FIG. 3 is a bottom plan view thereof;
FIG. 4 is a front elevational view thereof;
FIG. 5 is a top plan view thereof; and,
FIG. 6 is a rear elevational view thereof.