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Ground Penetrating Radar (GPR)
Before Radar, they used these giant concrete "Sound Mirrors" to detect incoming enemy aircraft - Abandoned Spaces
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Britain used these "Concrete Acoustic Mirrors" to detect enemy aircraft before radar - Arch2O.com
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The Concrete “Sound Mirrors” That Influenced WWII, Science, And Design
Giant Concrete "Sound Mirrors" were Used to Detect Enemy Aircraft Before Radar
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File:1815 - 131 Radar Station (former) - Concrete foundations of antenna base (5060999b5).jpg - Wikimedia Commons
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The concrete blocks that once protected Britain - BBC News
WW2: Britain's Giant Concrete Ears • Damn Interesting
NEW Leica IDS GeoRadar C-Thrue Concrete Scanner Ground Penetrating Radar
