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<p>[QUOTE=&quot;Cherryhill, post: 296506, member: 70&quot;]The ribbing on the inside is called an optic. It was done before the piece was blown to it s final shape, by blowing it into a mold which had ribs around the inner surface. When the piece was blown into the final shape, the piece was flattened on the outside and the ribs moved to the inside.[/QUOTE]</p><p><br /></p>

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