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The ornamental design for a helicopter step, substantially as shown. |
FIG. 1 is a perspective view of the helicopter step showing our new design;
FIG. 2 is an end view thereof;
FIG. 3 is a front view thereof;
FIG. 4 is a rear view thereof;
FIG. 5 is a top view thereof; and
FIG. 6 is a bottom view thereof.
Kent, David W., McNab, Robert B., Wolfe, James A.
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