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A comment on The Magnetic Amplifier – A Lost Technology of the 1950s. Parent comment
Tangentially, you can use a flame to emit sound directly http://onetuberadio.com/2018/07/02/flame-speaker-science-fai...
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Tangentially, you can use a flame to emit sound directly http://onetuberadio.com/2018/07/02/flame-speaker-science-fai...