The ornamental design for an extension for cone-shaped traffic marker, as shown and described.
FIG. 1 is a side elevational view of an extension for a cone-shaped traffic
marker showing my new design, the extension being shaded to indicate
contrast, the traffic marker being shown in broken lines for illustrative
purposes only;
FIG. 2 is a top plan view thereof;
FIG. 3 is a sectional view as seen from a plane indicated by a line 3--3 in
FIG. 2; and,