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<p>[QUOTE=&quot;Cherryhill, post: 4276238, member: 70&quot;]The &quot;optics&quot; are done by lowering the initial glass bubble into a wire frame with a number of wires equally spaced around it. Then withdrawing it and expanding the bubble into the final mold for it&#039;s shape. The same number of wires in the optic mold will produce the same effect in any factory they are used in. Optics can&#039;t be used (generally) to identify an manufacturer.[/QUOTE]</p><p><br /></p>

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