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The ornamental design for an extension ladder shelf, as shown and described. |
FIG. 1 is a perspective view of an extension ladder shelf showing my new design;
FIG. 2 is a side elevation taken generally from the lower right quadrant of FIG. 1, which elevation is a reverse mirror image of an elevation taken generally from the upper left quadrant of FIG. 1;
FIG. 3 is a top plan view thereof;
FIG. 4 is a front elevation taken generally from the lower left quadrant of FIG. 1.;
FIG. 5 is a bottom plan view thereof;
FIG. 6 is a back elevation taken generally from the upper right quadrant of FIG. 1.
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