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The ornamental design for a resin structure keystone ornamentation, as shown and described. |
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FIG. 1 is a perspective view of a resin structure keystone ornamentation showing my new design.
FIG. 2 is a front view thereof;
FIG. 3 is a right side view thereof;
FIG. 4 is a top view thereof; and,
FIG. 5 is a bottom view thereof.
The phantom line representations in FIGS. 1-5 are exemplary and form no part of the invention.
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