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

Re:The 'war tubas' we used to spot warplanes before radar (2... by SamReidHughes on Thursday May 28, 2020 @08:24AM (#23336411)
Detecting helicopters would be one situation where it could be useful for mobile troops on the ground.
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