Reference: Helena independent, page 2, date December 30, 1939.
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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.
No, it’s not the same.
I found an archive for the same paper dated Jan 03 1939 about an electronic microscope from the radio corporation of america? Op, can you post a link to your archive?
