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Future schemes of air defence
1930s, Air defence, Aircraft, Art, Civil defence, Nuclear, biological, chemical, Periodicals, Pictures

Future schemes of air defence

MONSTER EAR TRUMPETS FOR AIR DEFENCE During the last years of the Great War, sound detectors played an increasingly important part in the air defences of all the belligerents. Since those days they have undergone great development. Here the emperor of Japan is inspecting the huge trumpet-like detectors that work in conjunction with the anti-aircraft

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