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Geek Trivia: What Were Planes Detected With Before The Invention Of Radar?

March 13, 2019 Geek, How To

What Were Planes Detected With Before The Invention Of Radar?

Acoustic Mirrors
Telescopes
Pigeons
Ultrasound

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by Jason Fitzpatrick via How-To Geek

Geek Trivia: What Were Planes Detected With Before The Invention Of Radar?

Geek Trivia: What Were Planes Detected With Before The Invention Of Radar?

Reviewed by Ossama Hashim on March 13, 2019 Rating: 5

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