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The ornamental design for an emergency vehicle proximity warning signal, as shown and described. |
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FIG. 1 is a perspective view of an emergency vehicle proximity warning signal showing my new design, with the wire broken in the center to indicate indeterminate length;
FIG. 2 is a front elevational view thereof, with the wire and signal pick-up element shown in an alternate position;
FIG. 3 is a rear elevational view thereof;
FIG. 4 is a side elevational view thereof;
FIG. 5 is a side elevational view thereof;
FIG. 6 is a top plan view thereof; and,
FIG. 7 is a bottom plan view thereof.
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