Giant listening horn used to hear approaching aircrafts during WW1.
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exmilitary reblogged this from multitudinous
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nemolians reblogged this from peetypassion and added:
We won the war with Science.
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jhockey reblogged this from peetypassion and added:
第一次大戦中に使用された、敵軍飛行機の接近を聞くホーン
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peetypassion posted this
