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Acoustic radar
Acoustic Radar.
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Battleship Battlecruisers Cruisers
2023
Aircraft detection before radar, 1917-1940
Mad Scientists Unlimited
Stunning Visual Wonders: Pictures That Are Truly Fascinating (41 PICS)
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(Still More) Rare Historical Photos...
The Historic & the Historical ... Photos
Ear Trumpet
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Acoustic locator - Detecting enemy aircraft before the invention of Radar
Vintage News
Welcome to How Things Fly
Vliegen
Giant WWI war tubas were pretty much exactly what they sound like
LARP Props
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