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<p>[QUOTE=&quot;Oldhoopster, post: 3380289, member: 84179&quot;]I&#039;ve worked on trying to use acoustic testing to find internal defects in parts and have always had poor results. There seemed to be too much variability in the microstructures and lots of inhomogeneity. I would think that ancient planchets would have all kinds of variability due to the metallurgy.&nbsp; It would be great if it works, but my guess is it would be challenging[/QUOTE]</p><p><br /></p>

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