Wednesday, March 13, 2019

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

Ephraim Nonso 12:09 AM How-To Geek, Tech Republiq

What Were Planes Detected With Before The Invention Of Radar?

Acoustic Mirrors
Pigeons
Ultrasound
Telescopes

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via Tech Republiq

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