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A comment on The 'war tubas' we used to spot warplanes before radar (2018).

Re:The 'war tubas' we used to spot warplanes before radar (2... by inscartwheelies on Thursday May 28, 2020 @06:22AM (#23335618)
The next iteration, sound mirrors, were featured on Tom Scott.

https://youtu.be/04F5osXK4vw

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