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We claim the ornamental design for a protective helmet, as shown and described.
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FIG. 1 is a right-side view of a protective helmet showing our new design;
FIG. 2 is a left-side view thereof;
FIG. 3 is a front view thereof;
FIG. 4 is a rear view thereof;
FIG. 5 is a top view thereof;
FIG. 6 is a bottom view thereof;
FIG. 7 is a top, front and right-side perspective view thereof;
FIG. 8 is a bottom, rear and left-side perspective view thereof; and,
FIG. 9 is another right-side view thereof, the only difference residing in the removal of the broken line detail on the face shield in FIG. 1.
The details shown in FIGS. 1-9 form no part of the claimed design.
Sobel, Jay Richard, Myles, Justin, Hedge, Clint Alexander, Makris, Aristidis, Mitric, Bratislav, Farrell, Roderick, L'Abbé, Richard Jean
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