Reference: Helena independent, page 2, date December 30, 1939.

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[–] 2 points 5 months ago* (3 children)

Didn’t search for the article, but is it talking about this: https://en.wikipedia.org/wiki/Acoustic_microscopy?wprov=sfti1

On mobile in a meeting, sorry if I’m wrong.

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  • [–] 1 point 5 months ago (2 children)