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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 autokad on Thursday May 28, 2020 @12:35PM (#23339297)
very interesting. still could be useful against drones, especially as drones get used more and more in espionage and reconnaissance
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