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Giant listening horns like this were used to listen for approaching aircraft during the Great War once aircraft were used for more than just recon and became weapons | by Great War Observer

Giant listening horns like this were used to listen for approaching aircraft during the Great War once aircraft were used for more than just recon and became weapons | by Great War Observer

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Great War Observer By: Great War Observer

Giant listening horns like this were used to listen for approaching aircraft during the Great War once aircraft were used for more than just recon and became weapons

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Taken on January 26, 2009